I have a situation that has come up and I really need some help. My wife needs a new phone after smashing hers last night and we didn't have insurance on her line. We are on a family plan where I am the primary line and she is the secondary- both are unlimited data lines. I desperately want to keep unlimited data on my primary line but don't mind losing it on hers if she upgrades. My question is, will I lose my unlimited data if she (secondary line) upgrades her phone and loses her unlimited?