At the moment I am using VOIP to dial out. My VOIP carrier is a fixed DSL line. However in the event that my fixed DSL line fails, I want to connect a cell phone to my 3cx system, and then dial out via the cell phone. So the cell phone becomes the carrier. (It must be a cell phone, as the cell service provider requires an IMEI number) Is this possible? How do I connect the cell phone to my 3cx system, and what make and model of cell phone is preferred for this application. Do I need any other hardware?