Guides

What is a fax number?

Updated November 6, 2026

A fax number is a phone number that answers with a fax machine or an online fax service instead of a person. You only need one to receive faxes: to send a fax, you just need the other side’s number.

Do I need a fax number to send a fax?

No. When you send from dimefax.com/send, Dimefax dials from its own number. Recipients see that number, so if they need to reply, put your phone number or email on a cover page.

Can my mobile number receive a fax?

No. A fax is a phone call where two machines exchange tones; a mobile phone can’t answer that. To receive faxes, you need a number connected to a fax machine or an online fax service, which turns incoming faxes into PDFs you can read on your phone or in email.

How to get a fax number

With Dimefax, a number for a week is $5.99, once (handy when you’re waiting on one set of documents). To keep one, your own number is $9.99 a month with 100 pages included, or Unlimited sending and receiving is $19.99 a month. Received faxes show up on your account and in your email as a PDF.

What does a fax number look like?

Just like a phone number, with an area code: (503) 555-0147 in the US and Canada. Nothing in the number itself says it’s a fax line, so check with whoever gave it to you.

Questions

Can I receive a fax on my phone?

Not on your mobile number. You need a fax number from an online fax service, which delivers faxes to your phone as PDFs.

Do I need a fax number to send faxes?

No. You only need the recipient’s fax number. Dimefax sends from its own number.

How much is a fax number?

Online fax numbers usually cost a monthly fee. Dimefax’s is $5.99 once for a week or $9.99 a month.