Some good tips from the CTIA on leased devices: Consumer Tips on Leased Devices #3 is good one... "Be Careful Trading in Your Device. Leasing is popular, in part, because you can trade in your old phone with your carrier for a new device. Just be careful, and don’t accidentally trade in your leased phone to another carrier. We are hearing that some consumers are inadvertently turning in leased devices to a new provider, even though they don’t actually own the device. A leased phone traded in improperly to another operator could not only get you in trouble under your leased terms with fees and penalties, it increases the cost to deliver you service for all involved as everyone needs to sort out the phone’s ownership. After all, you would never trade-in a leased Toyota at a Honda dealership!"