Can formidable pro send to an electronic fax number?

Formidable doesn’t have the option to submit to a phone number unless that phone number can be extended into an email address. For example, most cell phone numbers can be turned into an email address. 123-456-7890 might turn into something like 1234567890@attwireless.com
Sending an email to the above email address would essentially send a text message to that number. You may look into whether your fax number has similar functionality.

Hope this gets you ointed in the right direction.