How to Unlock any Mobile Phone Using an Unlock Code or software on your Computer.

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A handset can be unlocked by entering a special code or by using a cable and software on your computer.

One of the most popular ways a mobile phone can be unlocked is by using a cable and software on a computer usually written specifically for your phone model. In some cases, special "phone clips" are used which re-program the software that controls the mobile phone, removing the SIM lock. However, such clips are usually very expensive. So some people opt for unlock codes.

The code required to remove all SIM locks from a mobile phone is called the master code. It is generated using a mathematical formula usually based on the phone's unique IMEI or MCC codes. However, this is easy to break and nowadays, the unlock codes are sometimes generated randomly and retained by the provider.

Typically, a locked mobile phone will display a message if a restricted SIM is used, requesting the unlock code. In some cases, the phone will simply display a message explaining that it is locked. For example, if you insert an incorrect SIM card from a different provider in your Virgin-mobile phone, the phone will display a message saying that you have used the wrong SIM card. Once a valid unlocking code is entered, the phone will display "Network unlocked" and you’ll now be able to use any SIM card in your mobile phone.

A SIM lock is a feature implemented by mobile phone manufacturers and providers to allow only the use of their SIM cards in their phones. Currently, phones can be locked to only accept SIM cards from the major UK mobile phone networks, i.e. Orange, Vodafone, T-Mobile, Virgin, Three and O2. This means, for example, that phones supplied by Orange can only take Orange SIM cards.

Types of SIM locks
A network lock only allows the use of the phone with specific networks. The most restrictive type of lock which can be used is the full SIM card lock, which means that a phone will only work with one SIM card. If that SIM card malfunctions or is damaged, the phone will no longer work and must be serviced.

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