What is a SIM lock

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SIM lock:

A SIM-LOCK, NETWORK-LOCK, carrier lock, imei lock or (Master) SUBSIDY lock serves as a technical limit built into CDMA and GSM smartphones by manufacturers for use by service providers to restrict the usage of these phones to specific locations and/or networks. This is in comparison with a phone (retrospectively called SIM-free or unlocked) that does not enforce any SIM restrictions.If the phones weren't locked, customers might sign a contract with one service, obtain the discounted phone, then quit paying the monthly bill (thus breaking the agreement) and begin using the mobile phone on a different mobile phone network or even sell the device for a profit. SIM locking curbs this by prohibiting a change of service (using a new SIM).

Unlocking Technology:

A device can be unlocked simply by entering a code supplied by the network operator. Alternative mechanisms include software working on the device or a computer attached to the handset, hardware devices that connect to the handset or over-the-air by the service provider. Usually the unlock process is permanent. The code needed to remove all locks from a phone is referred to as the master code, network code key, or multi-lock code. If the device is carrier locked it will usually display one of these messages: SIM network PIN blocked, Enter lock PIN.


The reason to unlock a device is usually to be able to use it with another SIM card. Users may wish to keep on using their mobile phone but with a different service or when traveling in another country they might like to connect to a foreign network using a prepay subscription.

Unlocking Services:

A number of companies offer a IMEI cell phone unlocking service . This service calls for those people who need to unlock a handset to provide their IMEI number to a service supplier and in most cases they will also ask for the country and network the phone is locked to, sometimes sent via email or entered on their website. The company will then supply (once you have paid) the unlock code for the mobile. For many manufacturers for example Nokia and Samsung various services additionally offer unique remote-unlocking software with directions, where a cable connection is required to remove the SIM lock at home. Such organizations may email the unlocking code or software which can remotely unlock the device. The price for unlocking a cellular phone can change dependent upon the network it's locked to and the mobile phone model itself, as every unlock code is unique to each individual handset.

Unlocking Service Providers:

Disappointingly there are a massive number of fraudulent on line retailers operating in the cellphone carrier unlocking industry. As a consequence it pays to ensure you find a honest supplier for these services. Take the necessary precautions and investigate any prospective providers prior to committing to place an order. In the case of on-line providers, make certain they specify their formal business name and corresponding registration details (every legitimate enterprise should be legally registered with the official governing bodies for their country of origin) and make certain they supply a legitimate certified address and contact details on their web-site. 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 never make payment via a direct transfer because this offers no fiancial safeguards. To aid with a search for a reputable supplier, we have supplied a list beneath (and in no specific order) of several genuine organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: