Hi!
I had the same problem a while ago and figured there had to be a modern solution. After doing some digging, I found a super clear guide on
derekdubois.net that explained exactly how to send faxes using just your phone. It turns out you don’t need any special hardware — your camera and the right app are enough. You scan your documents, convert them into PDFs, and then send them through a mobile fax app. The site also shares which apps are most reliable, which ones offer free trials, and how to check that your fax actually goes through.
I followed their steps, and it worked perfectly. My document was sent and confirmed in less than five minutes, and I didn’t have to print or leave home. Honestly, it’s much easier than I expected. If you ever need to fax something again, doing it from your phone is definitely the way to go.