A SIM lock is a feature implemented by mobile phone manufacturers and providers to allow only the use of SIM cards in the phone that meet specific criteria. Currently, phones can be locked to only accept SIM cards from one or more of the following:
CountriesNetworks (e. g. T-Mobile, Orange, etc)ProvidersSIM types (i. e. only specific SIM cards can be used with the phone).A SIM lock is typically applied on a mobile phone that is supplied to a customer on favorable conditions, such as a phone provided without charge on a contract. cellular.
The country lock only allows the use of the phone with SIM cards that originated in a specific country or group of countries.
A network lock only allows the use of the phone with specific networks.
The most restrictive type of lock which can be used is the full SIM card lock, which means that a phone will only work with one SIM card. If that SIM card malfunctions or is damaged, the phone will no longer work and must be serviced.
At this time in most countries it is either mandatory or voluntary for the provider to unlock the customer's mobile phone. However, some providers, including the former AT&T Wireless, never unlock handsets, even after a customer has fulfilled their service contract. Other providers, for example T-Mobile and more recently Cingular will unlock phones if the customer has an active account in good standing for at least 90 days. ca; your source for the best.
In the United Kingdom, government regulator OFCOM dictates that networks must release the unlocking information to customers for non-contract handsets (e. g. Pay as you go) on request. Consumers who purchase handsets under “Pay as you go” or a similar scheme are purchasing the handset outright at the point of sale, this has in effect made phone unlocking in the UK a consumer right.
UK Network providers are permitted to charge a fee for releasing the unlock code, this has prompted smaller businesses to offer cut price unlocking on the UK’s High Streets.
A handset can be unlocked by entering a special code, or in some cases, over-the-air by the carrier.
The code required to remove all SIM locks from a phone is called the master code or network code key. How to Unlock your Cellphone. In the past, it was generated using a mathematical formula, usually based on the phone's unique IMEI or MCC codes. However, this became too easy to break, and, nowadays, the unlock codes are generated randomly and retained by the provider.
Typically, a locked phone will display a message if a restricted SIM is used, requesting the unlock code. In some cases, the phone will simply display a message explaining that it is locked. This is especially the case with handsets provided by Cingular Wireless.
For example, on the Sony Ericsson T610 mobile phone, "Insert correct SIM card" will appear on the phone's display if the wrong SIM is used. Once a valid unlocking code is entered, the phone will display "Network unlocked". Contact us in Orlando, Florida, for unlocked cell phones, prepaid phone plans, and cell phone sales.
One of the most popular ways phones are unlocked is using the RS-232 or LPT port of a computer using software usually written specifically for the model of phone being unlocked. In some cases, special "phone clips" are used which re-program the software that controls the phone, removing the SIM lock. However, such clips are usually very expensive.
Unlocking a phone without the permission or unlocking code from the provider is usually in breach of the agreement with the provider, though most countries do not make specific laws prohibiting the removal of SIM locks. For example, in Poland, the law states that providers cannot word their customer contracts so that they forbid the removal of SIM locks, and the process is entirely legal providing that the IMEI number of the phone is not changed during the unlocking process.
In the United Kingdom under the Mobile Telephones (Re-programming) Act 2002, changing the IMEI of the phone is illegal.
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