What is a SIMLOCK

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SIM lock:

A simlock, network-lock, Carrier-Lock, imei-lock or (MASTER) SUBSIDY lock is really a technical limit built into GSM and CDMA cellphones by manufacturers to be used by carrier networks to restrict the use of these phones to specific countries and/or networks. This is not like a phone (retrospectively called SIM-free or unlocked) that doesn't enforce any SIM limitations.

The vast majority of cell phones can be unlocked to operate with any GSM network provider, however the phone might still display the original branding and may not support popular features of the new service provider. Aside from the locking, phones could also have firmware set up on them which is specific to the mobile phone network provider. This firmware is installed by the service provider and is separate from the locking mechanism. Virtually all phones can be unbranded by re-flashing another type of firmware type, an operation recommended for advanced users only.

Unlocking Technology:

Frequently, a locked phone will display a message if a restricted SIM is used, requesting the unlock code. On modern phone models operating on Android operating system software, the cell phone should display a message stating “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”. Some other models might display specific messages for example , "Enter special code" or "Enter unlocking code," or in some cases the device may simply show a message stating it's locked. Whenever a valid code is entered, the mobile phone displays "Network unlocked” or “Network unlock successful”.


Quite often a SIM-locked phone is marketed at a significantly lower cost than an unlocked one due to the fact the supplier expects income via its service. SIM locks are currently employed on less expensive (pay-as-you-go) units, though bargains on more costly handsets need a subscription which offers guaranteed income. Unlocked handsets have a a lot higher market value.

Unlocking Services:

Lots of organizations provide a carrier cell phone unlocking service . This service needs those people that wish to unlock a handset to give their IMEI number to a service supplier and frequently they will also request the country and cellular network the mobile is locked to, often sent through email or submitted on their web-site. The organization then will supply (once you have paid) a unlock code for the device.

Unlocking Service Providers:

Regrettably there are a lot of fraudulent sellers active in the cell phone IMEI unlocking industry. Consequently it pays to be sure you find a reputable provider for these services. To aid with your search for a legitimate service provider, we have supplied an inventory below (and in no particular order) of several legitimate organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: