Did you get blocked from your phone? That’s OK, it’s more common than you think – which is why the PUK (Personal Unblocking Key) was developed. If you entered your SIM number incorrectly more than three times in a row, the phone will become blocked. In order to start again, all you have to do is enter the PUK, which is printed on the SIM pack which you would have received with your SIM. Keep it safe as you may need it if you get blocked out of your mobile phone. If you lose it, you can retrieve your PUK code by dialling 1908 and following the prompts from the mobile menu