If I put an ATT 3g sim card into a used iPhone will I need to sign a new contract?

I have a phone with a $10/mo unlimited data plan (non-smart phone...samsung impression) and I was hoping to buy a used iPhone and put my sim in -- will I be forced to sign a 2 yr contract (I'm in one right now)? will I be able to keep paying $10/mo or does it automatically switch to 30/mo or 15/mo? Do I need to call ATT to do this?

SAINTS2010-06-16T14:13:15Z

Favorite Answer

No.

evilattorney2010-06-16T14:22:10Z

You don't need to sign a new contract. You will have to get an iPhone data plan for either $15/month (200mb) or $25/month (2gb). If you don't get the data plan, AT&T will automatically add one - which one they will add is unknown.

Anonymous2010-06-16T14:11:04Z

No. Just put the SIM into the phone.

Anonymous2010-06-16T14:12:15Z

Nope nope nope. Just insert the sim card.

?2010-06-16T14:12:05Z

if you buy an iPhone it automatically switches....woooow