I recently preordered an iPhone 6s and my parents both got an iPhone 6. Our contract was supposed to be up in March of next year, but Verizon let us upgrade early if we switched to a device payment plan, which we did. However, I'm not entirely sure on whether or not we need to send our old devices back, and if so, how would we do that? I believe it was mentioned somewhere, but I can't find information on sending your device back due to early upgrade. My Verizon is less than helpful.