[fopa138]

I currently have a 3g iphone i use now, i have an old 2g phone i wanted to use as well.... i put the sim from the 3g phone and placed it into the 2g phone i hooked it up to itunes and it activate it, it wanted me to change my plan,i was able to chose the $20 monthly payment and updated my att account.... now i pay 20 a month for my 3g phone. has anyone ever done this??? is my 3g phone working on the 2g network?? i really didnt notice the difference... Any advise?? Thanks