What is a Carrier Lock

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SIM lock:

A sim-lock, NETWORK-LOCK, Carrier Lock, IMEI LOCK or (master) SUBSIDY lock serves as a technical constraint built into CDMA and GSM phones by producers to be used by providers to limit using these phones to particular countries and/or networks. This is in contrast to a cell phone (retrospectively called SIM-free or unlocked) that does not enforce any SIM constraints.The key reason why quite a few carriers SIM lock their phones is because they offer mobile phones at a discount to consumers in return for for a contract to cover the use of the network for a given time period, in most cases between one to three years. This business model enables the business to recover the price of a phone covering the lifetime of the contract. Such reductions are worth around several hundred US dollars.

Unlocking Technology:

Commonly, a locked handset will show a message if a restricted SIM is used, requesting the unlock code. On the latest phone models operating on Android mobile phone software, the smartphone is going to display 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”. Other handsets may well display specific messages that include "Enter special code" or "Enter unlocking code," or in some circumstances the device will simply present a message saying that it's locked. As soon as a valid code is keyed in, the mobile phone handset displays "Network unlocked” or “Network unlock successful”.


The key reason to unlock a handset is to be able to utilize it with another type of SIM card. Customers might like to continue using their cell phone but with a new provider or while traveling overseas they may need to connect to a overseas network using a prepaid subscription.

Unlocking Services:

A few businesses offer a imei phone unlocking service . This service needs individuals that want to unlock a device to supply their IMEI number to a unlocking company and quite often they will also ask for the country and network the mobile phone handset is locked to, often sent by email or submitted on their web-site. The supplier will then provide (at a cost to you) the unlock code for the mobile phone.

Unlocking Service Providers:

Disappointingly there are a multitude of fraudulent online retailers operating in the smartphone carrier unlocking industry. As a consequence it is advisable to be certain you find a reputable supplier for such a service. To aid with your search for a legitimate supplier, we've supplied a listing below (and in no particular order) of a few genuine organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: