Sign up for a free fax number through sites such as eFax.com, FaxBurner.com or MyFax.com, as of 2015. Each site offers different additional benefits and restrictions on the free account and fax number, with some limiting the number or size of transmissions.
To sign up for a free fax number with eFax.com, click on the Sign Up button in the main navigation bar and provide the necessary information to create an account with the site. The free option limits the number of faxes you are able to send and your choices in the fax number but does not require you to provide any financial information. The account also provides you with access to the site's mobile app, which allows you to send faxes through the number from a supported device.
FaxBurner.com also offers a free subscription that grants you with a disposable fax number at no charge, meaning that it becomes inoperable after a set period of time. The site offers two levels of paid subscriptions, each of which allows for a single permanent number. The site also offers a mobile app, which allows you to fax and receive documents through an iPhone or iPad. MyFax.com offers a free fax number only through a 30-day trial in its premium membership program. After the period expires, you must begin paying the monthly fee to keep the fax number.