I was just wondering if anyone has tried to use a Magic Jack for a fax line in their truck. The printer I have is an all-in-one fax machine. I use it for printing/scanning my paperwork as-is, but still have to hunt down a truckstop when I have to fax something. They're cheap, but wondered if they'd work at all for a fax.

just use myfax.com you can have an 888-xxx-xxxx fax number....

Online Fax Pricing | MyFax

it uses your email. if i need something faxed to me (i don't need to be online at that time) i just give them my 888 fax number and later when i need to print it i just go online and it's in my email.
i call OR. for my permit as i drive down the road in WY and when i stop in ID for fuel i just go online and print it.

if i need to send a fax i just scan it into the laptop and attach it to an email and send to (the fax number) @myfax.com

works great and only $10 a month