What is a sim lock

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SIM lock:

A SIM-Lock, Network Lock, Carrier-Lock, imei-lock or (master) SUBSIDY lock is really a technical constraint built into GSM and CDMA cell phones by producers to be used by carriers to restrict using these phones to particular locations and/or networks. This is unlike a cell phone (retrospectively called SIM-free or unlocked) that does not impose any SIM restrictions.

Unlocking Technology:

Normally, a locked device will display a message if a restricted SIM is used, requesting the unlock code. On modern phone models working on Google android software, the phone is going to display a message saying “SIM network unlock PIN” or “Enter Network Lock Control Key” if it's network locked. Windows phones are going to display the message, “This SIM card can only be used on specific networks. Contact your customer service center for the unlock code”. Alternative models may very well show specific messages for instance "Enter special code" or "Enter unlocking code," or in some circumstances the handset will simply display a message saying it's locked. After a valid code is typed in, the device will display "Network unlocked” or “Network unlock successful”.


Device producers have financial incentives both to bolster SIM lock protection (which placates service organisations and permits exclusivity offers) and to weaken it (increasing a mobile phone's allure to customers who typically are not interested in the service provider that offers it). Also, making it too tough to unlock a handset might possibly make it much less attractive to network service providers who have a legal obligation to offer unlock codes for certain devices or in particular countries.

Unlocking Services:

A number of organizations provide a remote unlocking service . This service calls for people that want to unlock a mobile phone handset to provide their IMEI number to a service supplier and sometimes they will also request the country and network the mobile phone is locked to, either sent by email or entered on their web site. The company then will provide (at a cost to you) a unlock code for the mobile phone handset.

Unlocking Service Providers:

Regrettably there are many of fraudulent on line retailers working in the cellphone unlocking industry. Consequently it is recommended to ensure you locate a genuine supplier for such a service. To aid with a search for a legitimate supplier, we've provided an inventory below (and in no particular order) of several genuine organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: