Just wondering if anyone knows if replacement iphones (from apple) are sim locked? (e.g. the refurb units) My phone has just gone in for repair after a 'no signal' problem and they say they will be replacing it. I was wondering when the phone comes back will it know what network it is supposed to be on or could I activate it with an Orange sim or an O2 sim? Anyway hope you can help, the phone is an O2 3GS. Thanks.