Sending a fax with a laptop

[Speedy]

I got an Acer Travelmate 8204 that includes a modem (has an rj-11 port). Now I want to send a fax. Can I just connect my modem to the phone socket and use a fax application to send faxes? And is it also possible to send faxes when I connect my cell phone to my laptop and use it as a modem?

 

[Speedy]

Thanks for the help, guys

I'll connect my laptop to a phone line, because I only need to send one fax message.