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| US SIM cards work on a different standard, so a UK or European SIM card will not be transferable. Also as you note, the phones are locked to ATT, my understanding is that it is almost imposible to make it SIM-free, i.e will be unlockable .... | |
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I have used US (T-Mobile) cards in European phones before - never had a problem.
Permanent SIM-locking is illegal in the US. If a customer calls Apple, they have to unlock his phone for free, whether they want to or not.
http://www.dsltarife.net/news/2297.html (unfortunately I only found this German article).
dawiz