What is a SIM lock

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SIM lock:

A simlock, Network Lock, Carrier-Lock, IMEI LOCK or (master) SUBSIDY lock is actually a technical limit built into CDMA and GSM mobile phone devices by producers to be used by carriers to limit the use of these phones to specific locations and/or networks. This is not like a phone (retrospectively called SIM-free or unlocked) that does not enforce any SIM restrictions.If the devices were not locked, consumers might sign an agreement with one service, acquire the discounted phone, then quit paying the monthly payment (thus breaking the agreement) and begin using the mobile phone on another network or even sell the phone for a profit. SIM locking reduces this by barring a change of mobile phone network (using a new SIM).

Unlocking Technology:

A phone can be unlocked by entering a code provided by the network operator. Alternative mechanisms contain software working on the device or a computer or laptop attached to the handset, hardware devices that attach to the device or over-the-air by the provider. More often than not the unlock operation is permanent. The code needed to eliminate all locks from a phone is referred to as the master code, network code key, or multi-lock code. If the device is network locked it will usually display one of the following messages: SIM network PIN blocked, Enter lock PIN.


The key reason to unlock a mobile phone is going to be able to use it with a different SIM card. Consumers may need to continue using their cell phone but with a different provider or if traveling in another country they might want to connect to a overseas network using a pre pay subscription.

Unlocking Services:

A lot of businesses provide a online unlocking service . This service needs those people whom need to unlock a mobile phone handset to give their IMEI number to a unlocking company and often they will also request the country and cellular network the phone is locked to, sometimes sent through email or submitted on their web-site. The supplier then will supply (once you have paid) an unlock code for the mobile.

Unlocking Service Providers:

Unfortunately there are many of fraudulent on-line retailers operating in the cell-phone carrier unlocking industry. Consequently it is advisable to ensure you locate a reliable supplier for this service. Do your due diligence and investigate any prospective retailers prior to committing to submitting an order. In the case of on-line providers, ensure they list their registered organization name and corresponding registration details (every genuine enterprise should be legally registered with the official governing bodies within their country of origin) and make certain they supply a genuine certified address and contact information on their web-site. Additionally ensure that any payments made are done so thru legitimate methods 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 safeguards. To assist with a search for a legitimate service provider, we've provided a list just below (and in no specific order) of several genuine organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: