I am hoping to use a family plan for 3 iPhone 5c(s) and I want to know which is cheapest over all for the two entire two years and monthly, whether it must be unlocked or not. This includes the price of the phone itself. I have tried doing research on this but I am really bad at this kind of thing. I have seen some plans where you can either buy the phone itself for the unlocked price, for the normal price, or for $0 but with additional fees per month or option to unlock and not have those extra fees. I am really confused, please help!