I have looked into this but can't seem to find the answer.
If I am given a new 3G iphone that was originally an upgrade on someone else's contract, will it work with a different O2 payg sim card (ie not the contract o2 sim)? I thought being O2 it should still work, but someone said that the phone might be somehow linked to the contract sim card.
Also, is there a way of making the 3g iphone work on Orange? I know the first 2G one can be but I'm a little confused right now!