I went ahead and ordered an International Note to try and use Straight Talk.

I have no idea how ST works or what options I need. In my area T-mobile is horrible so I plan on only using it with ATT. When I went to order a sim it asked if I need a sim for an unlocked GSM model (which I believe mine is) or the ATT sim. Which one should I get or would either work?

Also, what size? The bigger one I suppose instead of the smaller size that's used in iPhones?

I'm very excited and anxious and want to get the sim on its way. I don't want to get the phone and be unable to use it!!