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SIM lock:

A sim-lock, Network Lock, Carrier-Lock, IMEI-Lock or (master) subsidy lock is actually a technical constraint built into GSM and CDMA smartphones by producers for use by carriers to restrict the usage of these phones to specific countries and/or networks. This is unlike a phone (retrospectively called SIM-free or unlocked) which doesn't enforce any SIM restrictions.

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 Google android software, the phone will show a message saying “SIM network unlock PIN” or “Enter Network Lock Control Key” if it is network locked. Windows phones are going to display the message, “This SIM card can only be used on specific networks. Contact your customer service center for the unlock code”. Other devices may very well show alternative messages such as "Enter special code" or "Enter unlocking code," or in some cases the handset will probably present a message saying that it's locked. As soon as a valid code is keyed in, the mobile phone displays "Network unlocked” or “Network unlock successful”.


Mobile phone producers have economic incentives both to improve SIM lock protection (which placates service organisations and will allow exclusivity discounts) and then to weaken it (increasing a smartphone's overall appeal to users who aren't interested in the service provider that offers it). In addition, making it too difficult to unlock a handset might possibly make it considerably less attractive to network service providers that have a legal responsibility to supply unlock codes for some devices or in selected countries.

Unlocking Services:

Plenty of companies provide a online unlocking service . This service calls for those people who want to unlock a mobile phone to provide their IMEI number to a service supplier and often they will also require the country and service provider the phone is locked to, sometimes sent through email or submitted on their website. The company then will provide (at a cost to you) an unlock code for the phone. For a lot of brands as in Nokia and Samsung many services additionally provide unique remote-unlocking software with instructions, where a cable is needed to remove the SIM lock at home. Such vendors may email the unlocking code or software that should remotely unlock the device. The price for unlocking a telephone will certainly differ based upon the mobile phone network its locked to and the handset model itself, as each unlock code is unique to each individual handset.

Unlocking Service Providers:

Disappointingly there are a multitude of fraudulent "businesses" operating in the smart phone imei unlocking industry. Consequently it is recommended to be sure you use a reliable service provider for these services. Do your due diligence and investigate any prospective dealers in advance of choosing to making an order. In the case of on-line suppliers, make certain they list their formal business name and associated registration information (every genuine organization has to be lawfully registered with the official authorities for their country of origin) and ensure they give a legitimate certified address and contact information on their website. Furthermore make certain that any payments made are via legitimate sources as in a recognized bank or financial institution using a debt or credit card, but do not ever make payment via a direct transfer as this provides no fiancial protection. To aid with a search for a legitimate company, we have supplied a list just below (and in no specific order) of a few legitimate organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: