answer:There are about 30 technical reasons you can’t. Most of these have to do with the way that faxes are encoded and decoded electronically (an analog function) while your cell phone is essentially a digital device. (That’s why VOIP generally can’t handle faxes, either – same analog-digital problem). But the simplest reason is that no cell phone supports a modular plug connection input that the all-in-one requires. It’s looking for a regular old modular cable, and cell phones don’t deal with that. You could probably rig something up – attach the cell to a PC using USB and then install the all-in-one to the PC as a peripheral device, but what would be the point of that? You are better off – if you do a lot of faxing – to subscribe to one of the fax-to-PC services that converts your scans (outgoing) to faxes and your incoming faxes to PDFs. And then emails them to you. But just plain vanilla, use the cell phone? No way.