can you you can try 5555.
Hello again ...my phone was working great on giffgaff untill I upgraded the firmware, could it of relocked it?
sounds like your phone is still locked , go to a high street phone shop and ask them to check it for you
make sure your phone is not locked
The firmware upgrade had relocked your Samsung Galaxy S3 to your previous network. You need to unlock it again. you can unlock your Samsung Galaxy S3 safer and easier using unlock code. You can get the unlock code either from your previous network provider or from any trusted private service like www.prounlocking.com/samsung-galaxy-s3/rs16wp9/ at low cost with easy instructions on unlocking.