I'm thinking of getting an iPad for a family member, and they are cheaper in the US than where I live. I'm going to the US in about a month so could get one while I'm there. However, I''m a bit unclear on the 3G issue. On the apple web site, it says this: Should I take this to mean that you can't use a foreign sim card while in the US? Or will any foreign provider with roaming services do? Or to put it more simply: is the type of sim card used restricted in any way?