When the phone says that the PIN is blocked and you need to enter the PUK (PIN Unlock Key) code, you need to enter the PUK code that you received with your phone. The PUK code is normally found either on a paper on the box your phone came in or on the documentation you received from your cellphone service provider when you bought the phone. Each SIM Card has a unique PUK code. Once you enter the wrong PIN a certain number of times, you are automatically prompted for the PUK code. If you do not know your PUK code and do not have any documentation of it, you will have to call your cellphone service provider for assistance in retrieving your PUK code. In most cases, they will unlock it for you from their office. So give them a call right now.