nicky50782 The correct format for a port authorisation code (PAC) is ABC123456. It should have 3 letters and 6 numbers. If yours is different to this, you may have requested the wrong thing from your network e.g. a PUK (personal unblocking key). If the PAC you have been issued is of the correct format and it is rejected by the giffgaff system, you need to contact your previous network provider and ask for a correct PAC.