What is a Network Lock

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SIM lock:

A sim-lock, network lock, CARRIER-LOCK, imei-lock or (MASTER) SUBSIDY lock serves as a technical limitation built into GSM and CDMA cell phones by producers to be used by carriers to restrict the use of these phones to particular countries and/or networks. This is unlike a cell phone (retrospectively called SIM-free or unlocked) which doesn't enforce any SIM constraints.Unlocking a mobile phone is almost universally legal. In addition, it's legal for providers to force SIM locks for certain time periods, differing by area.

Unlocking Technology:

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


Phone manufacturers have financial incentives both to bolster SIM lock security (which placates mobile phone network providers and enables exclusivity offers) and also to weaken it (extending a phone's appeal to customers that are usually not interested in the service provider that offers it). Also, making it too hard to unlock a handset could possibly make it less appealing to network service providers who have a legal duty to supply unlock codes for some handsets or in specific countries.

Unlocking Services:

Some businesses provide a online phone unlocking service . This service needs individuals that need to unlock a handset to supply their IMEI number to a service supplier and quite often they will also ask for the country and network the mobile phone handset is locked to, sometimes sent through email or entered on their web-site. The company then will supply (in return for a fee) an unlock code for the phone.

Unlocking Service Providers:

Disappointingly there are a multitude of scammers web sites working in the smart phone unlocking industry. As a consequence it pays off to ensure you find a trustworthy service provider for such a service. To assist with a search for a legitimate supplier, we've provided a listing beneath (and in no specific order) of several genuine organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: