I have a few questions.. 1) I'm going to buy the AT&T version and would like to use my iPad sim card to test it out- obviously I will have no voice, but this is definitely possible to do right? 2) If I do decide I like it and sign a contract with AT&T for 2yrs will I get it for the subsidized price of $200 (meaning I get a refund)? And, can I port over my current phone number that I have with Sprint? 3) Long shot, but my sim card for my iPad is one of the unlimited plans- would it be possible to just add voice to this data account and pay the extra monthly voice fees? 4) If I don't like the 4S, I believe I have 14 days to return it to the Apple Store right? Thanks in advance!