Update: Avoid efax at all costs, after they started sending me spam faxes (and charging me for them!) I tried to cancel and was told I had to call Hong Kong for the privilege. Long story short, find somebody else - there are lot's of digital fax companies, but do your research.
Today I needed to scan my credit card and send it to escrow.com in order to complete a domain name transfer. Having recently moved and being that I lost my printer cable in the process this could have been quite a challenge.
But then I realized my iPhone could probably handle everything I needed to do, so below is an outline...