I currently have an individual plan with an iPhone 4 and I have unlimited data since I was grandfathered in. However, I'd like to make my plan into a family plan and bring in my parents with iphone 4s as well and they too have unlimited data and if that is not possible at least I retain unlimited on my phone.
I have called ATT three different times and every single time I have gotten a different response,which leads me to believe they have no clue what is going on.