If you need to send a fax but don't have a fax machine, JotNot Fax can help. This app turns your iPhone or Android device into a portable fax machine, allowing you to fax Word (docx) or PDF files to any fax number from wherever you are. JotNot comes with a built-in scanner, so you don't need to find a scanner or fax machine if you have a paper document. Just scan in the document with your phone's camera, enter the fax number, and hit send.