What is a network lock

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SIM lock:

A SIM-LOCK, network-lock, CARRIER LOCK, imei-lock or (master) SUBSIDY lock is really a technical restriction built into CDMA and GSM smartphones by producers to be used by carrier networks to limit the use of these phones to specific countries and/or networks. This is in comparison with a cell phone (retrospectively called SIM-free or unlocked) which doesn't enforce any SIM constraints.Unlocking a mobile phone is practically universally legal. In addition, it is often legal for service providers to force SIM locks for certain periods of time, differing by region.

Unlocking Technology:

Typically, a locked smartphone will display a message if a restricted SIM is used, requesting the unlock code. On the latest phone models working on Android mobile phone software, the cellphone should show a message saying “SIM network unlock PIN” or “Enter Network Lock Control Key” if it's network locked. Windows phones will show the message, “This SIM card can only be used on specific networks. Contact your customer service center for the unlock code”. Some other handsets may very well display alternative messages for instance , "Enter special code" or "Enter unlocking code," or in some circumstances the handset may simply display a message saying that it is locked. After a valid code is entered, the mobile phone handset will display "Network unlocked” or “Network unlock successful”.


Handset companies have monetary incentives both to bolster SIM lock protection (which placates network companies and enables exclusivity offers) and weaken it (expanding a phone's overall appeal to buyers who aren't interested in the provider that offers it). Additionally, making it too tough to unlock a handset could make it much less attractive to mobile phone network service providers who've a legal responsibility to offer unlock codes for some handsets or in specific countries.

Unlocking Services:

Various organizations offer a IMEI phone unlocking service . This service calls for people that would like to unlock a mobile phone to supply their IMEI number to a service supplier and sometimes they will also ask for the country and cellular network the device is locked to, sometimes sent by email or entered on their website. The supplier then will provide (at a cost to you) an unlock code for the mobile phone handset.

Unlocking Service Providers:

Regrettably there are lots of dodgy companies operating in the smartphone IMEI unlocking industry. As a result it is prudent to be certain you locate a trustworthy supplier for such a service. To assist with a search for a reputable service provider, we have provided a listing beneath (and in no particular order) of a number of legitimate organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: