If I go to an ATT store to activate my Iphone 3g, do I have to start a new contract or can I add it to my family plan?

Also, is the data plan required, or can I go to additional options in the ATT wireless account page to disable it and just enable other things? (I know that may sound dumb)

if you have a family plan, all you have to do is add the $30 data plan to it. in mot sure if you have to renew your contract or not, because existing iphone owners will have their previous contract erased and they will have to start anew if they want to get the new iphone. Im not sure what you have to do to the family plan and how it will all work out in terms of the contract.