I need to unblock my phone - Samsung GT-E2550 Cell Phone

PUKs, or personal unblocking keys, are used to unblock a mobile phone which becomes blocked. Mobile phones may become blocked when a PIN (personal identification number) is entered incorrectly on three consecutive occasions. In some instances, the phone may become blocked, which requires a PUK to unblock it, and in other instances, the SIM (Subscriber Identity Module) card itself becomes blocked and again will require a PUK to unblock it. Mobile phones are also blocked when they are reported stolen and if there is an outstanding payment on the account. It is important to differentiate between unblocking phones (using a PUK) and unlocking mobile phones (using another type of code). NOTE: It is a criminal offence for anyone to attempt to unblock a mobile phone, other than the network provider who put the block on the phone. If your phone has become blocked by mistake, for example you have entered the PIN incorrectly on three consecutive occasions, then you need to contact the mobile phone network operator with your details. To explain a little more, specific to your mobile phone network, You need to go to your Service providers, web site & navigate your way to the specific PUK details for your mobile phone network operator. Usually you have to Register your phone to get a PUK code.