What is a Carrier Lock

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SIM lock:

A SIM-Lock, network-lock, CARRIER-LOCK, imei-lock or (MASTER) SUBSIDY lock is actually a technical limitation built into GSM and CDMA phones by producers to be used by service providers to restrict the use of these phones to specific countries and/or networks. This is in comparison with a phone (retrospectively called SIM-free or unlocked) that does not impose any SIM limitations.The primary reason quite a few network providers SIM lock their smartphones is because they offer cell phones at a discount to consumers in return for for a contract to cover using the network for a selected time period, commonly between one to three years. This business model enables the organization to recover the price of the mobile phone across the lifetime of the agreement. These kinds of reductions are worth around hundreds US dollars.

Unlocking Technology:

Frequently, a locked mobile will display a message if a restricted SIM is used, requesting the unlock code. On new phone models operating on Android operating system software, the phone will display a message stating “SIM network unlock PIN” or “Enter Network Lock Control Key” if it is 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”. Other models may very well show varying messages such as "Enter special code" or "Enter unlocking code," or in some circumstances the device may simply show a message saying it's locked. As soon as a valid code is entered, the mobile phone will display "Network unlocked” or “Network unlock successful”.


The key reason to unlock a mobile phone handset is to be able to use it with another type of SIM card. Consumers might want to keep on using their mobile phone but with a new provider or when traveling in foreign countries they might need to connect to a foreign network with a pre-paid subscription.

Unlocking Services:

Plenty of organizations provide a carrier mobile phone unlocking service . This service calls for people that want to unlock a mobile phone handset to supply their IMEI number to a unlocking company and in most cases they will also require the country and cellular network the mobile phone is locked to, often sent through email or entered on their web-site. The company will then supply (at a cost to you) the unlock code for the mobile phone. For some makes for example Nokia and Samsung many services additionally deliver unique remote-unlocking software with guidance, when a cable connection is necessary to remove the SIM lock from home. Such vendors may email the unlocking code or software which will remotely unlock the unit. The cost for unlocking a phone will certainly differ dependent upon the network it is locked to and the device model itself, as each unlock code is unique to each unique handset.

Unlocking Service Providers:

Regrettably there are a lot of fraudulent on line retailers active in the cell phone imei unlocking industry. As a consequence it is recommended to make sure you use a reputable service provider for such a service. To aid with a search for a legitimate supplier, we've provided an inventory below (and in no specific order) of a number of legitimate organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: