Will the 3G of iPad2 from USA work in Europe out of the box? I'm talking about the AT&T model. I know they're all factory unlocked. But I've noticed people discussing in forums that AT&T models need to be activated (somehow) in USA and them 3G will work with european SIM card. Is that true? I ordered from USA but I can ask my friends in USA to unpack it and activate if needed. But maybe it's not necessary and 3G will work on a new iPad2 from USA the same moment I will insert European SIM card (definitely not AT&T but local GSM provider)? Thanks!!!