A:AnswerVerizon and T-Mobile are together if your card fits on iPhone 6 it should work I have T-Mobile and all I have to do was just put in my card in the phone you can also go to Verizon and they should be able to tell you it would fit and work on their system If you have a iPhone and you want the iPhone 6 the one I have here too long is the card fits it will work on the phone but make sure you get a unlock phone
A:AnswerI currently use Straight Talk, which is a prepaid network. Now, if you want to use Sprint, you need to either buy the phone at their store OR purchase an unlocked phone.
A:AnswerYes it should work fine with Sprint because parents are part of On T-Mobile now and long is the card fits in it your old card from your phone if you have an iPhone 6s and you get an upgrade his phone is the same should work fine