I bought an unlocked iphone 3GS
I was told this was a factory unlock.
I upgraded the firmware to 3.1 through Itunes.
Now the phone is locked. (i.e. the screen which asks you to connect to PC and load itunes)
Itunes says that I need to install a SIM from a registered carrier.
If I now put in an 02 SIM (I am in the UK) will the phone work? or Have I locked the phone permanently?
I am trying to sell the phone and could do with knowing what damage I have done????
Any help would be appreciated.