My wife's 2 year contract will end with Sprint when the iPhone 6 is released. I am currently on AT&T with an unlimited data plan and $10 unlimited text for life. I also get a 20% EPP discount. Is there any way to get her on AT&T to utilize my 20% discount by adding another line to my service as a family plan so she can have her own individual capped data plan but I keep my unlimited?