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SIM lock:

A sim-lock, Network-Lock, carrier-lock, imei lock or (Master) subsidy lock is actually a technical limitation built into GSM and CDMA mobile devices by producers to be used by service providers to restrict the use of these phones to specific locations and/or networks. This is as opposed to a phone (retrospectively called SIM-free or unlocked) that does not enforce any SIM restrictions.

Unlocking Technology:

A phone can be unlocked by entering a code supplied by the network operator. Alternative mechanisms consist of software operating on the device or a pc attached to the phone, hardware devices that link to the handset or over-the-air by the service provider. In most cases the unlock process is permanent. The code required to get rid of all locks from a mobile phone is called the master code, network code key, or multi-lock code. If the device is network locked it will typically show one of these messages: SIM network PIN blocked, Enter lock PIN.


Smartphone producers have commercial incentives both to strengthen SIM lock security (which placates mobile phone network companies and allows exclusivity offers) and to weaken it (broadening a smartphone's overall appeal to users that aren't interested in the provider that offers it). At the same time, making it too hard to unlock a smartphone might possibly make it less desirable to mobile phone network service providers who have a legal responsibility to offer unlock codes for some devices or in specific countries.

Unlocking Services:

Lots of organizations offer a unlocking service . This service needs those people that want to unlock a phone to give their IMEI number to a service supplier and sometimes they will also ask for the country and service provider the device is locked to, sometimes sent by email or submitted on their web site. The organization then will supply (for a fee) the unlock code for the mobile phone.

Unlocking Service Providers:

Regrettably there are a great deal of fraudulent companies active in the smart-phone IMEI unlocking industry. Consequently it pays to ensure you use a honest provider for this service. To aid with your search for a trustworthy supplier, we have supplied a list beneath (and in no particular order) of several legitimate organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: