I need a PIN / PUK code for my mobile?
What is a PUK code?
PUK stands for Personal Unblocking Key. If you have entered you're PIN code incorrectly 3 times your sim card will be blocked and you will be unable to make and receive calls/texts.
You will need to obtain the PUK code from your Network/Service Provider - you will need to confirm some personal details for secuirty reasons before they will issue you with a PUK code.IMPORTANT WARNING: DO NOT guess your PUK code or enter the same wrong code again consecutively - as if you enter the wrong code 10 times you will permanently block the sim card and will then require a new sim card to be provided by your Network/Service Provider.
Call your Network Provider below to obtain code
|
09000 506 071- VODAFONE 09111 142 158- T-MOBILE 09075 750 974- ORANGE 090006 07 08 1- O2 09115 48 08 53- 3 NETWORK
|
--------------------------
MANY THANKS TO S&H SYSTEMS FOR THEIR EXCELLENT, PROFESSIONAL SUPPORT IN PROMOTING THIS WEBSITE, VISIT THEM AT:
http://www.sandhsystems.co.uk/
S&H Systems can provide any PC support that is required, such as our base service, PC repair, in your home, in your office or by postal service, or we can tailor full solutions to meet your internet requirements, including hardware & software training, wireless networking, accounts and installation.
We provide PC support for all computers and peripherals, including tier-one products such as HP Computers, Dell Computers etc.
We are also able to provide online sales of PC Spares and Upgrades
Other PC - related services include wireless networking, data recovery, online backup and more.
------------------------------------
-Common Mobile phone terms-
3G (Third Generation Wireless): refers to planned developments in mobile communications. Increased Bandwidth, from 128 Kbps while moving at high speeds to 2Mbps for fixed stations, will enable multimedia applications and advanced roaming features.
Abbreviated dialing: A subscriber can program a number into their phone with a corresponding short number code that will establish connection with the number required.
Account administrator: A corporate account administrator manages the bills of multiple users within a company.
Activation fee: A one time initial connection and setup fee charged by the service provider at the time of service initiation.
Active flip: A feature which will answer a call by opening the keypad cover, and end a call by closing it.
Airtime: Most wireless carriers bill their customers based on how much time the customer has spent on the carriers (the provider) network (the total time that a channel is occupied, including call time, call-set-up, and call-tear-down time). Most carriers bill in minutes increments, a few bill in seconds increments. Customer is charged for incoming and outgoing calls and also for toll-free calls. The airtime rate varies based on the time of day the call is made or received.
Alphanumeric display: A display capable of showing letters, numbers and other special characters.
Analogue: The traditional method of modulating radio signals so that they can carry information (as opposed to digital). AM (amplitude modulation) and FM (frequency modulation) are the two most common methods of analog modulation.
AMPS: AMPS stands for Advanced Mobile Phone System. AMPS was the first analog system used for providing cellular phone service. It works in the 800MHz frequency range. AMPS was introduced in 1983. Analog works by converting sound into electrical energy which is then transferred to the far end. The signal being transmitted is analogous (similar) to the original signal and is not digitized. Analog offers one voice conversation per voice channel.
Authentication: A fraud prevention technology used to verify a user's authenticity.
Automatic Message Accounting (AMA): The network functionality that measures, collects, formats and outputs subscriber network usage data to upstream applications for billing and other uses.
Asynchronous transmission: A mode of communication characterized by start/stop transmissions with undefined time intervals between transmissions.
Automatic number identification: The process of automatically identifying a calling number.
Baud: Unit of signaling speed (symbols per second).
Blocking: When a telephone call cannot be completed due to capacity constraints, it is said that the call is blocked.
Bluetooth: A low-cost, miniaturised radio communication technology that provides communication between devices such as cellphones, PDAs, and computers, and allows for connectivity to the internet.
Busy hour: The hour of the day (or week, or month, etc.) during which the telephone system carries the most amount of traffic (calls). All networks are designed with the busy hour traffic in mind.
Call holding: Enables you to put a caller on hold while a second call is answered or made.
Caller ID Blocking: When the incoming number is blocked from showing up on your display through called ID. Most often utilized by direct marketing organizations and bill collectors.
Call forwarding: A customized feature that allows customers to direct all incoming calls to another number.
Calling number identification or ID: A service whereby the calling party number can be identified by means of a visual or verbal indication at the called terminal.
Call screening: Facility on some answering machines that allows the user to hear who’s calling so they can decide whether to answer in person or not.
Call waiting: A customized feature that alerts you of an incoming call while you are on another call. You can then put your present caller on hold and answer the other call.
Car kit: An accessory that lets you use a portable phone in the car without having to hold it.
CDMA: Code Division Multiple Access. CDMA is a spread spectrum digital technology. CDMA works by spreading all signals across the same broad frequency spectrum and assigning a unique code to each signal. The signals are pulled out from all the other signals only by the receiver that knows the code. This process allows more calls to occupy the same space.
CDPD (Cellular Digital Packet Data): a digital data transmission technology developed for cellular networks. Operating at 19.2 Kbps, it sends data over constantly changing open intervals in voice channels. If the system is busy, the data is sent when a channel opens up.
Cell broadcast: Service provided by digital cellphone networks where useful info is provided to users via on-screen text messages.
Cellular: A radio phone system in which a network of transmitters links the mobile user to the public phone system. Each transmitter covers users in its own ‘cell’.
Channel: A pair of frequencies used by the mobile (i.e. one send and one receive frequency).
CLI: Calling Line Identification. A range of services in which the number of a caller can be accessed by the recipient.
CLIP: Calling Line Identity Presentation. A service that allows you to see who is calling you, before you pick up the call.
CLIR: Calling Line Identity Restriction. A service that stops the person you are calling from seeing who is calling before they pick up.
Clone: Whereby a ‘cloned’ analogue cellphone is illegally re-chipped with an ESN belonging to another. Can also refer to a phone ‘badged’ by one company and sourced from another.
Conference call: A call between three or more participants.
Contract: A service agreement with a provider for a specified length of time. Early termination of a contract is often accompanied by a cancellation fee. Not applicable to prepaid!
Coverage: The area in which a cellphone can make or receive calls.
Cradle: a stand or bracket designed to hold a phone or handheld computer in place on your desktop, or mounted to your dashboard. It may incorporate recharging or data transfer functions.
Desktop charger: Cradle for holding a phone upright while it is charging.
Digital: A method of decoding information for transmission. Information, or in this case, a voice conversation is turned into a series of digital bits - the 0s and 1s of computer binary language. At the receiving end, the information is reconverted. One of the main advantages of digital cellphones is that they allow several cellphones in the same area to use the same frequency simultaneously.
Digital switching: A process in which connections are established by operations on digital signals without converting them to analog signals.
Dual Tone Multifrequency (DTMF) signaling: Generic name for push-button telephone signaling equivalent to the Bell Systems TOUCH TONE®.
DTX: Discontinuous transmission. Battery-saving feature on some phones. When switched on, it conserves power by turning off transmission during pauses in speech. However, it impairs sound quality.
Dual-band: Phones that can switch between two different bands of frequencies. All new phones in the UK are now dual-band, capable of switching between GSM1800 and GSM900 frequencies. Useful for travellers, allowing roaming on a greater number of networks across the world.
Dual-mode: Phone that can operate using two different standards. Dual-mode digital/analogue cellphones are currently available in the USA.
EDGE (Enhanced Data GSM Environment): intended as incremental step toward 3G services. It operates at 384 Kbps, and enables multimedia transmissions and broadband applications for mobile phones and computers.
EPOC: an operating systems for handheld computers and mobile phones with Web access. It's an open operating system developed by Psion, and now licensed by Symbian. EPOC's main competitor is Windows CE.
Emission category: The more powerful the transmitter in your cellphone, the better it will be in giving you coverage in remote areas. Hand portable phones are Class 4 devices (as defined by the DTI) and offer maximum output of 2 Watts (although this is usually limited to 0.6 Watts). Carphones and transportables are usually Class 2 devices offering a maximum signal output of 8 Watts.
ESN: Each cellular phone is assigned a unique ESN, which is automatically transmitted to the cellular tower station every time a cellular call is placed.
FCC: Federal Communications Commission. The regulatory body in USA that governs telecommunications.
Frequency: The rate at which electric and magnetic fields of a radio wave cycles. Frequency is usually expressed in MHz (1,000,000 Hz); 1Hz (Hertz) = 1 cycle per second.
GPRS: GPRS stands for General Packet Radio Service. It is a system that allows for the transfer of information over GSM cellular networks in small packets, similarly to the way information is sent over the internet.
GPS: Global Positioning System. Satellite-based radio positioning system capable of providing specific location information to suitably equipped users anywhere on earth.
GSM: Global System for Mobile Communications. A digital cellular communications standard used throughout Europe, and elsewhere around the world. The standard is used in three frequency bands – 900MHz, 1800MHz, and 1900MHz.
Hand-over: As you move, the network transfers the handling of a call from one cell to another. This process happens automatically.
Hands-free-kit: An important safety feature that's included with most of today's mobile phones. It permits drivers to use their cellular phone without lifting or holding the hand-set to their ear. Available as an accessory for most mobile phones.
HDML (Handheld Device Markup Language): a language that formats information for mobile phones or handheld computers in the same way that HTML does for PCs. It was originally developed by Unwired Planet (now phone.com) and is considered to be the forerunner of WML (Wireless Markup Language). Most current HDML browsers are capable of interpreting WML sites.
HSCSD: High Speed Circuit Switched Data. An enhancement to GSM networks that enables data speeds to be boosted from 9.6kbps in multiples up to 57.6kbps, by combining timeslots.
IMEI: International Mobile Equipment Identity. A unique serial number used on digital mobile phones.
i-Mode: a packet based mobile phone service from Japan's NTT DoCoMo. I-Mode operates at 9.6 Kbps and uses a simplified version of HTML rather than WML. Its next generation system should support rates of 384 Kbps, enabling multimedia applications.
Inclusive talktime: Free minutes that are included in the monthly subscription. These do not apply to several service numbers, or to international calls.
International roaming: A service that allows you to use your cellphone overseas, and ensures you’re always available on the same number.
IrDA: A phone that is irDA-enabled can connect wirelessly to a mobile computer with an infra-red port.
ISDN: Integrated Services Digital Network. High quality fixed telephone line used primarily for data transfer or video conferencing.
LAN: Local Area Network. Communications system used by offices that connects computers to their servers, and allows employees to share files and printers.
Mobile Phone: Also known as a car phone - the type of cellular phone that's installed in a car, truck or van. There are three main types of cellular phones being sold today: mobile, transportable and portable. A mobile unit is attached to the vehicle, draws its power from the vehicle's battery and has an external antenna.
Modem: Modulator/Demodulator that converts binary to analog signals and analog to binary signals. Used in digital devices like computers over analog telephone lines.
MSA/RSA: (Metropolitan Statistical Area/Rural Service Area). MSAs are cities with at least 50,000 people, or urban areas with at least 100,000, and the counties that include these areas. RSAs are all areas not included in MSAs. The FCC licenses and assigns freqencies in these areas, allowing multiple carriers.
NAM: Number Assignment Module. A memory that contain subscriber, systems and options details about a cellular telephone.
Off Peak: The period of time after the business day has ended during which carriers may offer reduced airtime charges.
OGM: Outgoing message. What the caller hears when they dial your answer machine or voice-mail box.
One-touch memory: Button on a phone that allows you to dial a number just by pressing this one key. Also known as a fastkey.
Palm OS: the operating system originally designed for the Palm series of PDAs. Palm has since been purchased by 3Com, but they still develop and license the OS. Unlike operating systems used by other handhelds, the Palm OS is built to function on a particular type of device.
PABX: Private Automatic Branch Exchange. Automated multi-extension exchanges or switchboards as used nowadays by most offices.
PBX: Private Branch Exchange. Multi-line switchboard exchange, as used in many offices.
PC card: Small accessory that allows you to connect a suitable digital mobile phone with a portable computer. Primarily designed for sending and receiving faxes and digital files (such as email).
PCMCIA card: An older term for the PC card.
PCS (Personal Communications Services): an all-digital set of cellular services operating in the 1850-1990 MHz bands. PCS technologies include CDMA, TDMA, AND GSM.
PDA: Personal Digital Assistant. A small handheld device commonly used as a mobile computer or personal organizer. Many PDAs incorporate small keyboards, while others use touchscreens with handwriting recognition. Some of these devices have Internet capabilities, either through a built-in or add-on modem.
Peak: Highest-usage period of the business day when a cellular system carries the most calling traffic.
Pocket PC (formerly Windows CE): an upgraded version of Windows CE that offers greater stability and a new interface. Features include mobile Internet capabilities, an e-book reader, and handwriting recognition.
Portable: A one-piece, self-contained cellular telephone. The newest portable model phones are so small - weighing as little as 3.1 ounces - that they can be folded up and carried in a suit pocket or purse. Portables normally have built-in antennas and a rechargeable battery.
Predictive text: Predictive text allows for faster typing of text messages on the handset’s keypad, by completing words as they are typed.
Pre-pay/Prepaid: Term used for no-contract, no rental charge services where you buy credit ‘vouchers’ in advance for calls. Each network has its own pre-pay service.
PTT: Push-To-Talk. A radio switch (usually part of the microphone) that must be pushed before the user can transmit. Normal in two-way radio.
PUK code: Your PUK code allows you to unblock your phone if an incorrect PIN has been entered more than three times.
Receiver: Equipment that receives radio frequencies from the air and converts it back into the form of the input signal, like audio.
RF: Radio frequency. Term used to describe the signal transmitted or received by a mobile phone.
Roaming: Using a cellular phone through a system other than the usual "home" switch.
RS232: Connection socket commonly found on computers. Some cellphones have the ability to be connected to a PC through this socket to facilitate the updating of personal directories, or for writing SMS text messages.
RSA: Rural Service Area (USA). Small cellular service areas.
Serial Number: Each cellphone sold has a unique serial number, usually printed underneath the battery. If your phone is stolen, it is essential that you have this number, so that you can have it blocked from further use.
Service Plan: A rate plan selected by subscribers when they start up cellular service, usually consisting of a base rate for system access and a per-minute rate for usage.
SIM: Subscriber Identity Module. The smart card used in digital phones. It carries the user’s identity for accessing the network and receiving calls and also stores personal information, such as a phone directory and received SMS messages.
Smartphone/Webphone: a mobile, digital telephone that has features not associated with traditional home or mobile phones. These features include Internet access, simple text messaging, and data services.
SMS: Short Message Service. Originally part of the GSM system, it refers to any text messaging service available on digital mobile phones.
Standby time: The number of hours that a freshly-charged battery will keep a mobile running without making or receiving a call. When it is switched on, power is used continuously by the phone to keep it in contact with the local cell site, so that the network knows where you are, should you receive a call.
Switch: In wireless radio, the connecting switch between the telephone network and the radio base station. Also called the Mobile Exchange, MTSO, MTX, MSC.
Talktime: The number of minutes of continuous speech that a freshly charged battery will allow you to make on a cellphone.
Tariff: A list of charges for services provided. Tariffs are usually made up of a fixed monthly fee and call costs that vary depending on the time of day you make your calls. Some tariffs include a fixed number of free calls per month.
TDMA: Time Division Multiple Access. A digital system that divides cellular channels into three time slots, increasing data capacity. This lets multiple users or conversations to be carried on the same channel.
Transmitter: Equipment that converts input signals, like audio, into radio frequency that can be transmitted through air to a receiver.
Transportable: The transportable cellular phone is a standard mobile phone that can be removed from the vehicle and used by itself with an attached battery pack. The entire unit is generally mounted or built into a custom carrying case to make it easy to carry. Although technically "portable," the transportable should not be confused with smaller, one-piece cellular phones.
Time division multiplexing (TDM): Sharing a transmission link among multiple users by assigning time intervals to individual users during which they have entire bandwidth of system.
T9: Predictive text inputting system designed to make text message writing easier. Instead of having to select letters individually by pressing each key numerous times, mobiles with T9 software ‘guess’ what you’re writing as you go along, reducing the number of key presses required.
Tri-band: Triple-band phones are capable of operating on three GSM frequency bands – the GSM 900 and GSM 1800 frequencies used in over 100 countries worldwide plus the GSM 1900 frequency band that’s increasingly being adopted in America.
Two-way paging/Interactive paging/Two-way Messaging: Sending and receiving data over the Web, via the paging network.
UMTS: Universal Mobile Telecommunications System. New mobile communications standard offering numerous voice, data and multimedia applications. The eventual successor to GSM.
Voice Activated Dialling: A feature available only on selected phones that permits you to dial numbers by calling them out to your cellular phone, instead of dialing them manually. This function is especially convenient for making calls from your vehicle while driving.
Voice recognition: Facility offered by a few handsets enabling calls to be made by using voice commands rather than punching in numbers. The memory can be programmed to store and identify names spoken into the handset and call numbers associated with them.
Voicemail: Mobile phone service provided by the networks that records a message for you when you can’t, or don’t want to answer a call. Unlike a traditional answeringmachine, the system can take messages for you when you are using the telephone.
WAP: Wireless Application Protocol. An agreed standard which enables WAP-compatible mobile phones to access Internet-type services (such as news, travel, entertainment, finance, sport etc) via their menu system and LCD screens. WAP is supported by most wireless networks and operating systems. It supports HTML and XML, but is designed for WML.
WCDMA: Wideband Code Division Multiple Access. Air interface standard which will enable Third Generation mobile phones to carry new mobile multimedia services (see UMTS).
Web Clipping: The process of pulling specific information from a web page so that it can be displayed on a webphone or PDA.
Windows CE: A version of Windows designed to run on PDAs or other small devices. CE was renamed Pocket PC with the version 3.0 release.
WML (Wireless Markup Language): a language developed to control the presentation of web pages on mobile phones and PDA in the same way that HTML does for PCs. Part of the Wireless Access Protocol (WAP), WML is an open standard, and is supported by most mobile phones.
XHTML: a reworking of HTML 4.0 designed to work as a application of XML. It allows anyone to create sets of markup tags for new purposes.
XML (Extensible Markup Language): a standard for creating expandable information formats that allow both the format and the data to be shared. XML is similar to HTML in that both use tags to describe the contents of a document. However, while HTML only describes how the data should be displayed or used, XML describes the type of data. This allows anyone who can interpret those tags to use the data they contain
HERE IS SOME MORE INFORMATION
Hope it helps you understand what an IMEI number is!
IMEI : stands for "International Mobile Equipment Identity"
Generally the IMEI number is of 14 to 17 digits
The IMEI is a number unique to every GSM and UMTS mobile phone. It is usually found printed on the phone underneath the battery and can also be found by dialing the sequence *#06# into the phone.
There is a frequent use of reading IMEI in mobile phone development. People generally use IMEI for license/full version support of an application.
The IMEI number is used by the GSM network to identify valid devices and therefore can be used to stop a stolen phone from accessing the network. For example, if a mobile phone is stolen, the owner can call his or her network provider and instruct them to "ban" the phone using its IMEI number. This renders the phone useless, regardless of whether the phone's SIM is changed.
From Wikipedia, the free encyclopedia
A Personal Unblocking Code (PUC) or Personal Unblocking Key (PUK) is used in GSM mobile phones and some smartcards to unblock a blocked card.
Most mobile telephones offer the feature of personal identification number (PIN) protection. After switching on the phone, the user, if the PIN security function is not switched off, is requested to enter a 4-8 digit PIN enabling the phone's non-emergency calling functions. If the wrong PIN is typed in more than three times, either the SIM card, the device or both become locked. They can be reverted to their original unlocked state by entering a PUC, provided by the service operator through verification. If the wrong PUC is entered ten times in a row, the device will become permanently blocked and unrecoverable, requiring a new SIM card. Cellular phone users are therefore advised by most providers to keep their PUC written down in a safe place separate from the device.
International Mobile Equipment IdentityThe International Mobile Equipment Identity or IMEI (pronounced /aɪˈmi¢°/) is a number unique to every GSM and UMTS mobile phone. It is usually found printed on the phone underneath the battery and can also be found by dialing the sequence *#06# into the phone.
The IMEI number is used by the GSM network to identify valid devices and therefore can be used to stop a stolen phone from accessing the network. For example, if a mobile phone is stolen, the owner can call his or her network provider and instruct them to "ban" the phone using its IMEI number. This renders the phone useless, regardless of whether the phone's SIM is changed.
Unlike the Electronic Serial Number or MEID of CDMA and other wireless networks, the IMEI is only used to identify the device, and has no permanent or semi-permanent relation to the subscriber. Instead, the subscriber is identified by transmission of an IMSI number, which is stored on a SIM card which can (in theory) be transferred to any handset. However, many network and security features are enabled by knowing the current device being used by a subscriber.
Contents[hide] |
The IMEI (14 digits plus check digit) or IMEISV (16 digits) includes information on the origin, model, and serial number of the device. The structure of the IMEI/SV are specified in 3GPP TS 23.003. The model and origin comprise the initial 8-digit portion of the IMEI/SV, known as the Type Allocation Code (TAC). The remainder of the IMEI is manufacturer-defined, with a Luhn check digit at the end (which is never transmitted).
As of 2004, the format of the IMEI is AA-BBBBBB-CCCCCC-D, although it may not always be displayed this way. The IMEISV drops the Luhn check digit in favour of an additional 2 digits for the Software Version Number (SVN) in the format AA-BBBBBB-CCCCCC-EE
| AA | BBBBBB | CCCCCC | D | EE |
|---|---|---|---|---|
| Reporting Body Identifier, indicating the GSMA-approved group that allocated the model TAC | The remainder of the TAC | Serial sequence of the model | Luhn check digit of the entire number (or zero) | Software Version Number (SVN). |
Prior to 2002, the TAC was 6 digits long and followed by a two-digit Final Assembly Code (FAC), which was a manufacturer-specific code indicating the location of the device's construction.
For example the IMEI code 35-209900-176148-1 or IMEISV code 35-209900-176148-23 tells us the following:
TAC: 352099 so it was issued by the BABT and has the allocation number 2099
FAC: 00 so it was numbered during the transition phase from the old format to the new format (described below)
SNR: 176148 - uniquely identifying a unit of this model
CD: 1 so it is a GSM Phase 2 or higher
SVN: 23 - The 'software version number' identifying the revision of the software installed on the phone. 99 is reserved.
The format changed from April 1, 2004 when the Final Assembly Code ceased to exist and the Type Approval Code increases to eight digits in length and became known as the Type Allocation Code. From January 1, 2003 until this time the FAC for all phones was 00.
The Reporting Body Identifier is allocated by the Global Decimal Administrator; the first two digits must be decimal (ie less than 0xA0) for it to be an IMEI and not an MEID.
The new CDMA Mobile Equipment Identifier (MEID) uses the same basic format as the IMEI.
On many devices the IMEI number can be retrieved by entering *#06#. The IMEI number of a GSM device can be retrieved by sending the command AT+CGSN. For more information refer the 3GPP TS 27.007, Section 5.4 /2/ standards document.
Retrieving IMEI Information from a Sony or Sony Ericsson handset can be done by entering these keys: Right * Left Left * Left * (Other service menu items will be presented with this key combination).
The IMEI information can be retrieved from most Nokia mobile phones by pressing *#92702689# (*#WAR0ANTY#), this opens the warranty menu in which the first item is the serial number (the IMEI). The warranty menu also shows other information such as the date the phone was made and the life timer of the phone.
The IMEI can frequently be displayed through phone menus, under a section titled 'System Information', 'Device', 'Phone Info' or similar. Many phones also have the IMEI listed on a label in the battery compartment.
The IMEI will display on the device page of iTunes for an iPhone after syncing.
On refurbished phones the IMEI may be different for the software and the actual phone itself. You can check this by looking behind the phone where the battery is placed (phone IMEI) and by pressing *#06# on your phone (software IMEI)
Many countries have acknowledged the use of the IMEI in reducing the effect of mobile phone theft, which has increased exponentially over the last few years[citation needed]. For example, in the United Kingdom under the Mobile Telephones (Re-programming) Act, changing the IMEI of a phone, or possessing equipment that can change it, is considered an offence under some circumstances.
There is a misunderstanding amongst some regulators that the existence of a formally allocated IMEI number range to a GSM terminal implies that the terminal is approved or complies with regulatory requirements. This is not the case. The linkage between regulatory approval and IMEI allocation was removed in April 2000 with the introduction of the European R&TTE Directive. Since that date, IMEIs have been allocated by BABT (acting on behalf of the GSM Association) to legitimate GSM terminal manufacturers without the need to provide evidence of approval.
Other countries use different approaches when dealing with phone theft. For example, mobile operators in Singapore are not required by the regulator to implement phone blocking or tracing systems, IMEI-based or other. The regulator has expressed its doubts on the real effectiveness of this kind of systems in the context of the mobile market in Singapore. Instead, mobile operators are encouraged to take measures such as the immediate suspension of service and the replacement of SIM cards in case of loss or theft.[1]
When mobile equipment is stolen or lost, the operator or owner will typically contact the Central Equipment Identity Register (CEIR) which blacklists the device in all operator switches so that it will in effect become unusable, making theft of mobile equipment a useless business.
The IMEI number is not supposed to be easy to change, making the CEIR blacklisting effective. However this is not always the case: IMEI may be easy to change with special tools and operators may even flatly ignore the CEIR blacklist.
The last number of the IMEI is a check digit calculated using the Luhn algorithm.
According to the IMEI Allocation and Approval Guidelines,
The Check Digit is calculated according to Luhn formula (ISO/IEC 7812). See GSM 02.16 / 3GPP 22.016. The Check Digit shall not be transmitted to the network. The Check Digit is a function of all other digits in the IMEI. The Software Version Number (SVN) of a mobile is not included in the calculation. The purpose of the Check Digit is to help guard against the possibility of incorrect entries to the CEIR and EIR equipment. The presentation of Check Digit (CD) both electronically and in printed form on the label and packaging is very important. Logistics (using bar-code reader) and EIR/CEIR administration cannot use the CD unless it is printed outside of the packaging, and on the ME IMEI/Type Accreditation label. The check digit shall always be transmitted to the network as "0".
The check digit is validated in three steps:
Conversely, one can calculate the IMEI by choosing the check digit which would give a sum divisible by 10. For the example IMEI 49015420323751?,
| IMEI | 4 | 9 | 0 | 1 | 5 | 4 | 2 | 0 | 3 | 2 | 3 | 7 | 5 | 1 | ? |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Double even digits | 4 | 18 | 0 | 2 | 5 | 8 | 2 | 0 | 3 | 4 | 3 | 14 | 5 | 2 | ? |
| Sum digits | 4 + (1 + 8) + 0 + 2 + 5 + 8 + 2 + 0 + 3 + 4 + 3 + (1 + 4) + 5 + 2 + ? = 52 + ? | ||||||||||||||
To make the sum divisible by 10, we set ? = 8, so the IMEI is 490154203237518.
This disclaimer governs your use of our website; by using our website, you accept this disclaimer in full. If you disagree with any part of this disclaimer, do not use our website. (2) Intellectual property rights Unless otherwise stated, we or our licensors own the intellectual property rights in the website and material on the website. Subject to the licence below, all these intellectual property rights are reserved.
(3) Licence to use website You may view, download for caching purposes only, and print pages from the website for your own personal use, subject to the restrictions below. You must not:(a) republish material from this website (including republication on another website);(b) sell, rent or otherwise sub-license material on the website;(c) [reproduce, duplicate, copy or otherwise exploit material on our website for a commercial purpose;](d) [edit or otherwise modify any material on the website; or(e) [redistribute material from this website [except for content specifically and expressly made available for redistribution
[Where content is specifically made available for redistribution, it may only be redistributed [within your business].](4) Limitations of liability
The information on this website is provided free-of-charge, and you acknowledge that it would be unreasonable to hold us liable in respect of this website and the information on this website.Whilst we endeavour to ensure that the information on this website is correct, we do not warrant its completeness or accuracy; nor do we commit to ensuring that the website remains available or that the material on the website is kept up-to-date.To the maximum extent permitted by applicable law we exclude all representations, warranties and conditions (including, without limitation, the conditions implied by law of satisfactory quality, fitness for purpose and the use of reasonable care and skill).Our liability is limited and excluded to the maximum extent permitted under applicable law. We will not be liable for any direct or indirect loss or damage arising under this disclaimer or in connection with our website, whether arising in tort, contract, or otherwise. Without limiting the generality of the foregoing exclusion, we will not be liable for any loss of profit, contracts, business, goodwill, data, income, revenue or anticipated savings arising under this disclaimer or in connection with our website, whether direct or indirect, and whether arising in tort, contract, or otherwise. However, nothing in this disclaimer shall exclude or limit our liability for fraud, for death or personal injury caused by our negligence, or for any other liability which cannot be excluded or limited under applicable law.
(5) Variation
We may revise this disclaimer from time-to-time. Please check this page regularly to ensure you are familiar with the current versio(6) Entire agreementThis disclaimer constitutes the entire agreement between you and us in relation to your use of our website, and supersedes all previous agreements in respect of your use of this website.(7) Law and jurisdictionThis disclaimer will be governed by and construed in accordance with English law, and any disputes relating to this disclaimer shall be subject to the exclusive jurisdiction of the courts of England.
IF YOU DO NOT AGREE WITH ANY / OR PART OF THESE TERMS AND CONDITIONS, PLEASE DO NOT USE.
You can contact us by email to ask any questions you may have.
email address: chris@007.la
