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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 CDMA and GSM mobile devices by producers to be used by providers to restrict the use of these phones to specific locations and/or networks. This is contrary to a cell phone (retrospectively called SIM-free or unlocked) which doesn't impose any SIM restrictions.SIM locking is incredibly common if subsidized devices are sold with pre pay contracts. It is important to note, however, that the technology tied in with the cell phone will have to be compatible with the system being utilized by the network carrier. A GSM cellphone will only work with a GSM carrier and will not operate on a CDMA network. Likewise, a CDMA cell phone will only work with a CDMA service and won't work on a GSM service. Note that more recent (2013+) pricier mobile phones are capable of supporting both CDMA and GSM technologies, making it possible for customers to use their mobiles on pretty much any network.

Unlocking Technology:

Usually, a locked device will show a message if a restricted SIM is used, requesting the unlock code. On the latest phone models operating on Android os software, the cell phone will show a message saying “SIM network unlock PIN” or “Enter Network Lock Control Key” if it's network locked. Windows phones should show the message, “This SIM card can only be used on specific networks. Contact your customer service center for the unlock code”. Several other devices might show different messages including "Enter special code" or "Enter unlocking code," or sometimes the handset may simply present a message saying that it's locked. Whenever a valid code is entered, the mobile phone handset displays "Network unlocked” or “Network unlock successful”.


Most of the time a SIM-locked smartphone is offered at a noticeably lower cost than an unlocked one due to the fact the supplier expects income thru its service. SIM locks are employed on more affordable (pay-as-you-go) mobiles, while discounts on costlier handsets demand a subscription that gives guaranteed income. Unlocked mobiles have a higher market value.

Unlocking Services:

Several businesses provide a remote unlocking service . This service needs individuals who would like to unlock a mobile phone handset to give their IMEI number to a unlocking company and sometimes they will also request the country and cellular network the mobile is locked to, frequently sent via email or submitted on their web-site. The supplier will then supply (at a cost to you) the unlock code for the phone. For a few manufacturers for instance Nokia and Samsung several services also supply unique remote-unlocking software with directions, where a cable connection is necessary to remove the SIM lock at home. Such companies may email the unlocking code or software that should remotely unlock the unit. The price for unlocking a phone will fluctuate dependent upon the mobile phone network it is locked to and the mobile phone model itself, as every unlock code is unique to each unique device.

Unlocking Service Providers:

Regrettably there are a lot of scammers companies operating in the smartphone carrier unlocking industry. Consequently it pays off to make sure you locate a trustworthy supplier for these services. Take the necessary precautions and investigate any prospective dealers before committing to making an order. In the case of on line suppliers, make sure they publish their registered organization name and matching registration information (all authentic enterprise is required to be legally registered with the official governing bodies within their country of origin) and make sure they give a legitimate listed address and contact information on their web-site. In addition ensure that any payments made are thru legitimate methods for example a recognised bank or financial institution using a debt or credit card, but never make payment via a direct transfer because this offers no fiancial safeguards. To assist with your search for a legitimate supplier, we have provided an inventory just below (and in no particular order) of a number of legit organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: