How do T mobile phone upgrades work?
T-Mobile Jump is something you add to your plan that costs an extra $10 a month. After 6 months you can jump by handing over your old phone and getting a new one. The remaining cost on your old phone is gone, you just have to start paying on the new phone. (jump means you don't need to pay off the old phone)
Not sure. Don't be so afraid to call t-mobile customer service then ask them what plans they offer and the all the details.