Hello migs619. The "Unreturned Device" fee is typically a charge added to your account for equipment in your possession and is not currently being used actively in your services. This fee is usually removed when the equipment is returned back to Comcast. If you'd like assistance reviewing the charge and would like more detailed information, I can help. Please send me a private message and include your full name and service address so I can access your account. To send a private message: click my name (ComcastJoeTru) to view my profile. Then click the link that says "Send a message" and there you can private message me.