"In the age of email, instant messaging and 4G connections, there's only one lame excuse for the continued existence of the fax machine, a gadget that had its heyday in the 1970s, and that excuse has to do with signatures. Some companies and their lawyers will only accept a scribbled signature as valid on contracts and forms, so if you want to file that loan application or send in your insurance claim form with your signature on it, fax may still be your best option.
However, three things will finally slay the fax. First, more companies will start accepting online forms with electronic signatures as valid, so someone's illegible signature on a hard copy isn't needed. Second, for those who just can't let go of the signature requirement, touch devices will allow people to scribble their John Hancocks into digital forms. Finally, the death of landlines will also mean death for fax machines." - Avram Piltch