I was talking to a buddy of mine who is a techie for a phone company and he said that it's not. I put my att sim into a viewsonic viewpad7 (I think that's the one) and it says it has unlocked 3G. I was able to make a phone call but he it's different than using data. He said that if you use data, it may allow you for a little while but the tower will recognize it's not your plan and shut it down.
I was hoping that I'd be able to get a tablet and take it to a show somewhere that doesn't have wifi (I seem to go a lot of places like this with no wifi) and be able to put my att 3G card into it and get data / phone that way without having to purchase another $50/mo data plan.
Is that possible? Is there an android 3.0 device out there that does this? He said what I want is not approved by the FCC and not able to be done.