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 a technical limit built into GSM and CDMA mobile phones by manufacturers to be used by carriers to limit using these phones to a particular countries and/or networks. This is as opposed to a phone (retrospectively called SIM-free or unlocked) which doesn't impose any SIM constraints.Unlocking a cellphone is nearly universally legal. At the same time, it is legal for service providers to force SIM locks for certain amounts of time, varying by area.

Unlocking Technology:

A handset can be unlocked simply by entering a code supplied by the network operator. Alternative mechanisms include software operating on the device or a computer connected to the phone, hardware devices that link to the mobile or over-the-air by the provider. In most cases the unlock procedure is permanent. The code required to remove all locks from a mobile phone is referred to as the master code, network code key, or multi-lock code. If the phone is carrier locked it will usually display one of the following messages: SIM network PIN blocked, Enter lock PIN.


Mobile phone makers have economic incentives both to improve SIM lock protection (which placates mobile phone network organisations and will allow exclusivity discounts) and to weaken it (widening a phone's overall appeal to buyers who aren't interested in the service provider that offers it). Also, making it too hard to unlock a mobile may possibly make it less attractive to mobile phone network service providers that have a legal responsibility to supply unlock codes for certain devices or in certain countries.

Unlocking Services:

A few businesses offer a permanent mobile phone unlocking service . This service calls for all those who want to unlock a device to supply their IMEI number to a unlocking company and often they will also request the country and cellular network the mobile phone is locked to, either sent through email or entered on their web site. The supplier will then provide (for a fee) a unlock code for the mobile phone. For a lot of manufacturers for example Nokia and Samsung a variety of services also offer unique remote-unlocking software with directions, where a cable is necessary to remove the SIM lock from home. Such suppliers may well email the unlocking code or software which will remotely unlock the unit. The cost for unlocking a telephone will certainly differ dependent upon the network its locked to and the smartphone model itself, as every unlock code is unique to each individual device.

Unlocking Service Providers:

Regrettably there are a multitude of dodgy web sites operating in the mobile phone carrier unlocking industry. Consequently it is recommended to be sure you use a genuine provider for these services. Do your due diligence and investigate every potential dealers prior to committing to place an order. In the case of on-line sellers, make certain they list their registered company name and matching registration details (every legit organization has to be legally registered with all the official authorities for their country of origin) and make certain they supply a genuine certified address and contact details on their website. Additionally make certain that any payments made are by legitimate sources as in a recognized bank or financial institution using a debt or credit card, but never ever make payment via a direct transfer because this provides no fiancial safety. To aid with the search for a trustworthy service provider, we've supplied a listing beneath (and in no specific order) of several genuine organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: