I called at&t today and this is what u can do. When u order the iphone 5 do it by adding a line. you will have to activate it on your account then you can go into your online account and convert it to family talk plan. Once the iphone 5 is activated and you have the family plan u take the iphone 5 and a dumb phone into at&t store. They will give you a new nano sim for the iphone 5 making it your existing number. Also get a regular sim card for the new line and put it in the dumb phone. This will enable you to get rid of the data plan and texting on the new line making this line cost you only $10 a month. Then throw the phone in a draw until you need it to upgrade next year. I think this is what i am going to do. Hopefully all goes well but if not and something comes up I don't like I can always return it during the return period and cancel the new line penalty free.