My Fax Number (+1 412 415 7244) is the cheapest phone plan I have. It is $5 + overages. Since I am never likely to send a fax, and almost never need to receive a fax, this price will be relatively simple. My fax line is an e-Fax service. They provide a number where faxes go to. The fax is converted into a .pdf file, and emailed to me. If I need to send a fax, I will create the .pdf, and send it via email. The system will then send the fax with my fax number displayed. The only would be worries I will have is people faxing the wrong number.