I have recently bought a nokia 3220 under the advice that it wasn't locked, however the damn thing is locked to the tesco network, I have tried to unlock it 4 times using the codes from trycktill.com but to no avail! the serial number is 357623008995548 these are the codes 1+ 7 I tried: #pw+353316277115125+1# #pw+989242004774651+7# and i tried a couple others from some soft ware a friend sent. Can anyone help me with a code??