I am planning on buying a new iPhone 5 as my current phone is having a lot of issues. Just in case, my current phone is the Samsung Galaxy Nexus. I know I have an upgrade available, but do not wish to lose my unlimited data, so I just want to find out if I can buy the new phone, and have it billed to my account. If that is possible, how long do I have to pay for the new phone in full? Is it setup as a payment plan, or do I need to pay in full before the next billing period takes place? Any help would be greatly appreciated!