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SIM lock:

A SIMLOCK, Network-Lock, carrier-lock, imei lock or (MASTER) subsidy lock serves as a technical constraint built into GSM and CDMA cellphones by manufacturers to be used by providers to restrict the usage of these phones to particular locations and/or networks. This is in contrast to a phone (retrospectively called SIM-free or unlocked) that doesn't enforce any SIM restrictions.SIM locking is incredibly common if subsidized handsets are offered with pre-paid contracts. What is important to note, however, that this technology tied in with the smartphone will have to be compatible with the system being used by the network carrier. A GSM mobile is only going to work with a GSM carrier and will never work on a CDMA service. In a similar fashion, a CDMA cellphone can only work with a CDMA network and isn't going to operate on a GSM service. Note that more recent (2013 and newer) high end mobiles are capable of supporting both CDMA and GSM technologies, permitting users to use their mobiles on any type of network.

Unlocking Technology:

A smartphone can be unlocked by entering a code supplied by the network operator. Different mechanisms incorporate software running on the device or a pc connected to the handset, hardware devices that attach to the phone or over-the-air by the provider. Usually the unlock procedure is permanent. The code required to get rid of all locks from a cell phone is known as the master code, network code key, or multi-lock code. Generally if the device is carrier locked it will typically show one of these messages: SIM network PIN blocked, Enter lock PIN.


The key reason to unlock a mobile is going to be able to utilize it with another SIM card. Users might want to keep on using their cellphone but with a new service or when traveling in another country they might want to connect to a foreign network with a prepay subscription.

Unlocking Services:

Lots of companies offer a unlocking service . This service requires all those who need to unlock a handset to provide their IMEI number to a service supplier and frequently they will also request the country and service provider the handset is locked to, either sent through email or submitted on their website. The company then will provide (at a cost to you) an unlock code for the mobile phone handset.

Unlocking Service Providers:

Unfortunately there are a lot of scammers "businesses" working in the smart phone network unlocking industry. Consequently it pays off to ensure you use a honest provider for such a service. Take the necessary precautions and investigate all prospective providers before choosing to place an order. In the case of on line sellers, make sure they provide their registered business name and corresponding registration information (every authentic organization must be lawfully registered with all the official authorities for their country of origin) and make certain they give a legitimate listed address and contact details on their web site. In addition make sure that any payments made are thru legitimate methods as in a recognised bank or financial institution using a debt or credit card, but never ever make payment via a direct transfer as this offers no fiancial safety. To aid with a search for a reputable supplier, we've provided a checklist just below (and in no particular order) of several legit organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: