If I buy an unlocked phone in the UK

amro

macrumors 6502
and cut my 3GS sim card, do I have to do anything else? Do I need to let AT&T know? Not trying to hide anything, just need to know if I have to register or re-register the phone with AT&T.

I'm working here in the UK and contract free iPhone 4's are not locked. I'm sticking with AT&T because I have a good international data plan through the premiere option.
 
and cut my 3GS sim card, do I have to do anything else? Do I need to let AT&T know? Not trying to hide anything, just need to know if I have to register or re-register the phone with AT&T.

I'm working here in the UK and contract free iPhone 4's are not locked. I'm sticking with AT&T because I have a good international data plan through the premiere option.

you should be OK. AT&T wont mind because you will still be paying your monthly fees to them, and they wont even know that you've cut the sim card down and put it into the new iphone
 
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