hi guys, can someone please clarify for me the iPhone unlocking / locking situation in the US? Here's what I plan to do: 1) buy a iPhone 4 at the Apple Store for Full Price 2) take it to another country (say, Canada or Mexico) and have it unlocked, use it for a few days on a local provider 3) come back to the US and use it on AT&T - if I bought at full price, then there is no contract, right? Would it need to be re-locked to AT&T at this point? 4) Eventually, re-sell it in a country where the iPhone 4 is not yet available, but would be supported. Anyone see a problem with this strategy? Thank you!