I will be moving to brazil next week for 6 months and I have been informed that I need to UNBLOCK my telephone to allow other sim cards to be of use in my phone. I have just got my PUK code but i have no idea how to do this. Can someone please advise me.
You can also fill out an unlocking form here. If you're on Pay Monthly, you can unlock at any time and it's free. If you're on PAYG, you need to have had your phone for at least 12 months and you'll need to pay a £15.00 fee which they'll take from the credit on your phone (so ensure you've topped up).
