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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 CDMA and GSM cellular phones by producers for use by providers to limit the usage of these phones to specific countries and/or networks. This is contrary to a cell phone (retrospectively called SIM-free or unlocked) which doesn't impose any SIM constraints.SIM locking is extremely common if subsidized phones are offered with prepay contracts. It is important to note, however, that the technology accompanying with the mobile phone needs to be compatible with the system being used by the network carrier. A GSM cell phone can only function with a GSM carrier and will never operate on a CDMA network. Similarly, a CDMA smartphone can only work with a CDMA service and isn't going to work on a GSM network. Note that more sophisticated (2013 and newer) pricier cell phones are capable of supporting both CDMA and GSM technologies, allowing for customers to use their phones on any kind of network.

Unlocking Technology:

A mobile phone can be unlocked by entering a code provided by the network operator. Alternative mechanisms consist of software operating on the handset or a computer connected to the handset, hardware devices that link to the mobile or over-the-air by the provider. In most cases the unlock operation is permanent. The code required to do away with all locks from a cellphone is referred to as the master code, network code key, or multi-lock code. Generally if the handset is carrier locked it will usually display one of these messages: SIM network PIN blocked, Enter lock PIN.


More often than not a SIM-locked mobile is sold at a significantly lower price than an unlocked one mainly because the supplier anticipates income via its service. SIM locks are currently employed on more affordable (pay-as-you-go) mobiles, whilst deals on costlier handsets require a subscription which offers guaranteed income. Unlocked devices have a better market value.

Unlocking Services:

A certain amount of companies provide a online mobile phone unlocking service . This service needs people whom want to unlock a mobile to give their IMEI number to a unlocking company and often they will also need the country and cellular network the device is locked to, sometimes sent by email or entered on their web site. The organization then will provide (at a cost to you) a unlock code for the mobile phone handset.

Unlocking Service Providers:

Disappointingly there are a great deal of scammers on line retailers active in the cell phone unlocking industry. Consequently it is prudent to be sure you use a trustworthy service provider for these services. Do your due diligence and investigate every prospective suppliers prior to choosing to submitting an order. In the case of on line suppliers, make sure they specify their registered company name and matching registration details (all authentic business has to be lawfully registered with all the official authorities in their country of origin) and ensure they provide a genuine listed address and contact details on their web site. In addition ensure that any payments made are by 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 because this offers no fiancial safeguards. To aid with the search for a legitimate company, we have provided a listing below (and in no particular order) of a number of legit organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: