I have a friend, in Portland, OR who has 2 iPhones & now an iPad 3G/wi-fi. He was doing fine on the iPad, until it came time to renew his ATT contract for the iPad, which he did.
Now all he's getting is "no service" on the iPad. His 2 iPhones are still working fine.
Anyone have this happen to them? He's a techy geek type....is it Apple? the iPad? or ATT. He's puzzled. I could offer no insights as my iPad in another town is working fine.