I wonder if I just did something stupid. I purchased a phone off contract from apple as I want an unlocked phone, but I just used it to activate my AT&T upgrade new sim chip (instead of using the upgrade phone that came with the SIM). Would this cause the off-contract phone to be locked to at&t?? I guess it's too late now as I've submitted the info (IMEI) to at&t already. If they lock it, I guess I can always return the phone to apple and repurchase a guarantee unlocked one later..