Hi all, in the UK with a 64GB 3G. I cut down an o2 sim card, placed it in the iPad, all works fine. If one tries to ring the phone number associated with the sim card, it will ring once and then the call gets rejected. Tried it with my contract Vodafone sim that I use with my 3GS, same thing happens again. I knew the phone call wouldn't go though, I assumed it would just go to voicemail or something like that. Anyway, just a warning for those of you who plan on swapping sims between your iPad and your iPhone, if someone calls you, you will not know as the call won't go to voicemail.