Hi @Tabbzy,
I'm not quite sure what lock you want to unlock, is the device locked to an operator? If it is, you will need to get in touch with the operator to receive a network unlocking code.
If you can't remember the PIN code for the SIM card, enter a wrong one a couple of times and you will be asked to enter the PUK code. This code can generally be found on the card you received with the SIM card, or can be provided to you by your operator.
Let me know if that helps!
