If my phone is due for an upgrade, do I have to start a whole new 2 year plan? I'm pretty sure my phone is due for an upgrade this month (What does that even mean? Does it do something to the price if you can upgrade?) and I don't want to start a whole new plan because my plan isn't up until April. So, if I upgrade my phone, do I have to start a new plan? I have nationwide Unlimited plan by the way.