I'm hoping someone can provide a little bit of clarity. Myself and two other family members have phones with AT&T. I have mine through the iPhone Upgrade Program, which will be eligible to upgrade next month, and the other two lines were done through AT&T Next. The two through AT&T next are already paid off. Now, if we wanted to switch to Sprint & use the iPhone Upgrade Program when the new iPhone is released, how would we go about doing so? Do we already have to have an account with Sprint in order to utilize the IUP? I apologize in advance if this is a dumb question & any help would be greatly appreciated!