Hello AT+T,

 

I currently own an i-Phone 3GS, legitimately bought from the Vietnam Apple store. 

 

I’ll be moving for college to Columbus, Ohio in the fall and it seems that it will be possible to use my iPhone with AT&T, but I have 2 questions:

 

1) What would be the most suitable AT&T plan that would let me use the 3GS network and has favourable intl text/call rates?

2) After moving to the US can I still switch my SIM cards? (i.e. when I go home to visit my family may I take out my US SIM and use my Vietnamese SIM for the duration of my stay?)