Ok this might be a little complicated so I will go slow. My family, mother father and me, are on my grandfathers plan. We are going to leave his plan and "form" our own plan (mother father and me). Still with me? Ok good. Now my mom and dad are going to get non-pda phone but are going to purchase unlimited internet and unlimited texts for the plan. If I buy an iPhone 3G will there be any additional cost above that of the unlimited web/text already supplied by ATT according to my parents plan?