So, Me and my son are on one account on sprint. He has an evo 4g and I have a samsung intercept. It is alot of money each month, so we want to go onto my sister's account plan. She went into the sprint store today and asked if that could be done for the 2 of us (she has 3 on her account now) and they said you are able to do that. So, my question is, if we drop our plan(for 130 bucks) and go onto hers so it will be cheaper, will we have to keep the phones we have now, or can we get new ones for a lesser price? We both want to get the iphone 4s, and are wondering how much it would be if we went on her account. Thanks