What is a SIMLock

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SIM lock:

A sim-lock, network lock, carrier-lock, imei-lock or (Master) SUBSIDY lock is actually a technical restriction built into GSM and CDMA cell phones by producers for use by carrier networks to limit the usage of these phones to a particular locations and/or networks. This is unlike a cell phone (retrospectively called SIM-free or unlocked) that does not enforce any SIM limitations.SIM locking is really common if subsidized phones are offered with pre pay contracts. You should to note, however, that the technology accompanying with the smartphone will need to be compatible with the systems being used by the network carrier. A GSM mobile can only work with a GSM carrier and is not going to function on a CDMA network. Similarly, a CDMA phone is only going to work with a CDMA network and isn't going to operate on a GSM service. Keep in mind that more sophisticated (2013 onwards) top end mobiles are equipped to support both CDMA and GSM technologies, enabling customers to use their smartphones on nearly every network.

Unlocking Technology:

Commonly, a locked handset will display a message if a restricted SIM is used, asking for the unlock code. On recent phone models operating on Google android software, the smartphone is going to display a message saying “SIM network unlock PIN” or “Enter Network Lock Control Key” if it is 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”. Alternative devices could show different messages such as "Enter special code" or "Enter unlocking code," or in some cases the mobile will simply present a message stating it's locked. Whenever a valid code is keyed in, the phone displays "Network unlocked” or “Network unlock successful”.


The main reason to unlock a phone is to be able to utilize it with a different SIM card. Users may need to continue using their cellphone but with a new service or when traveling in another country they might need to connect to a foreign network with a prepay subscription.

Unlocking Services:

Several businesses provide a permanent unlocking service . This service calls for those people whom want to unlock a device to provide their IMEI number to a service supplier and quite often they will also request the country and service provider the device is locked to, sometimes sent through email or entered on their website. The company then will provide (at a cost to you) a unlock code for the mobile phone handset.

Unlocking Service Providers:

Disappointingly there are a lot of dodgy companies working in the cell phone imei unlocking industry. Consequently it is advisable to be sure you find a reputable supplier for this service. To aid with the search for a reputable service provider, we have provided a listing just below (and in no particular order) of a number of legitimate organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: