Most dialup modems have the ability to send and receive faxes.
Even if you have a dialup modem, to receive faxes, you'd have to leave your computer on with your fax software running at all times. To fill the need, several companies, like Jfax and eFax , among others have sprung up to offer free fax services on the Web. Most of these companies allow you to receive faxes for free, but charge you a small monthly charge to receive faxes. Some few companies offer free fax sending, but for three to five dollars a month you can avoid the hassle the free services put you through. If you're cheap like Tom, and still have a dial-up modem, you can receive faxes from a Web fax provider for free, and then send them through your regular faxmodem.