You can always call ATT customer service & ask. Though am going to guess that ATT is going to say if you would like a current deal, it will have to be on a current plan. So you will have to give up the old family plan for the bogo offer. Again, just guessing.
Sorry. I should have added a few more details. I called ATT customer retention dept three times now to try and get clarification. Last night the guy was nice but didnt think I could do the deal without ditching my data plan. Today, first call, lady said I could add a line and then cancel after 45 days, then said BOGO was expired so nothing I could do. Third call later today said BOGO still available but I had to add third line and keep it open for the life of the phone.
Bummer is I have been on ATT/Cingular/ATT since 1998 and the current trend doesn't reward loyalty at all. All about creating new lines and luring in new customers. Very short term thinking if you ask me but thats the way it is..
Anyways, I really like the S7A and will probably get it at some point. Just frustrated with ATT at the moment.