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 really a technical restriction built into GSM and CDMA cellular phones by producers to be used by carriers to limit the use of these phones to specific countries and/or networks. This is not like a phone (retrospectively called SIM-free or unlocked) which doesn't enforce any SIM constraints.SIM locking is really common if subsidized phones are sold with prepaid contracts. It is crucial to note, however, that this technology accompanying with the cell phone has to be compatible with the systems being used by the network carrier. A GSM cellular phone is only going to operate with a GSM carrier and isn't going to work on a CDMA network. Moreover, a CDMA mobile phone is only going to work with a CDMA network and isn't going to operate on a GSM network. Be aware that new (2013 onwards) pricier cell phones are capable of supporting both CDMA and GSM technologies, allowing for users to utilize their mobile phones on any network.

Unlocking Technology:

Usually, a locked phone will show a message if a restricted SIM is used, requesting the unlock code. On the latest phone models operating on Google android software, the mobile phone is going to show a message saying “SIM network unlock PIN” or “Enter Network Lock Control Key” if it's 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”. Some other handsets may very well show different messages for example "Enter special code" or "Enter unlocking code," or sometimes the phone may simply present a message saying that it's locked. After a valid code is typed in, the handset displays "Network unlocked” or “Network unlock successful”.


The primary reason to unlock a mobile phone is usually to be able to use it with a different SIM card. Consumers might want to continue using their mobile phone but with a different service provider or if traveling in another country they may want to connect to a international network by using a prepay subscription.

Unlocking Services:

Lots of organizations offer a remote smartphone unlocking service . This service calls for those people who wish to unlock a handset to supply their IMEI number to a unlocking company and quite often they will also need the country and network the handset is locked to, either sent via email or entered on their website. The company will then provide (at a cost to you) an unlock code for the device.

Unlocking Service Providers:

Regrettably there are lots of scammers service providers active in the smartphone imei unlocking industry. As a result it pays off to ensure you locate a honest supplier for these services. Do your due diligence and investigate all potential retailers before choosing to place an order. In the case of on-line providers, ensure they document their registered business name and matching registration information (all legit company has to be legally registered with the official authorities for their country of origin) and make sure they supply a genuine listed address and contact details on their web-site. Additionally make certain that any payments made are via legitimate sources for example a recognized bank or financial institution using a debt or credit card, but do not ever make payment via a direct transfer because this offers no fiancial security. To aid with your search for a reputable supplier, we have provided a checklist beneath (and in no particular order) of a few legitimate organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: