What is a IMEI LOCK

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SIM lock:

A sim lock, NETWORK-LOCK, carrier-lock, imei lock or (master) SUBSIDY lock serves as a technical restriction built into CDMA and GSM cell phones by producers for use by carriers to restrict the use of these phones to particular countries and/or networks. This is not like a mobile phone (retrospectively called SIM-free or unlocked) that does not enforce any SIM restrictions.SIM locking is very common if subsidized phones are offered with prepay contracts. It is really important to note, however, that this technology accompanying with the mobile phone has to be compatible with the systems being utilized by the network carrier. A GSM cellular phone will only function with a GSM carrier and will not operate on a CDMA service. Likewise, a CDMA phone can only work with a CDMA service and will not operate on a GSM network. Take note that modern (2013+) higher priced mobiles are equipped to support both CDMA and GSM technologies, permitting customers to use their phones on every network.

Unlocking Technology:

Typically, a locked phone will display a message if a restricted SIM is used, requesting the unlock code. On the latest phone models running Android software, the mobile phone is going to show a message stating “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”. Some other models might show differing messages for example , "Enter special code" or "Enter unlocking code," or in some circumstances the phone will probably display a message saying that it's locked. Whenever a valid code is keyed in, the phone will display "Network unlocked” or “Network unlock successful”.


On many occasions a SIM-locked smartphone is offered for sale at a noticeably cheaper cost than an unlocked one due to the fact the service provider anticipates income thru its service. SIM locks are applied on cheaper (pay-as-you-go) handsets, though discounts on costlier handsets need a subscription that provides guaranteed income. Unlocked devices have a a lot higher market value.

Unlocking Services:

Many companies provide a on-line mobile phone unlocking service . This service calls for individuals whom wish to unlock a handset to provide their IMEI number to a unlocking company and often they will also require the country and cellular network the mobile phone is locked to, either sent by email or submitted on their web-site. The supplier will then supply (once you have paid) an unlock code for the mobile phone.

Unlocking Service Providers:

Unfortunately there are a huge number of dodgy on-line retailers operating in the cell phone imei unlocking industry. Consequently it is advisable to make sure you use a reliable supplier for such a service. To assist with the search for a trustworthy service provider, we have provided an inventory beneath (and in no particular order) of a few legitimate organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: