> My bank still accepts fax documents. All I would have to do is find a fax machine ...

On linux you can use [efax](https://linux.die.net/man/1/efax) and a modem and... ooops, good luck finding a modem.

I did this for real ~10 years ago when a stupid company didn't accept a scanned PDF by email and required a fax of the actual document "because security". The difference is that I had a modem in an old laptop at that time, so I just send them the same scanned PDF.

Now I'm wondering if there is a provision for sending faxes somewhere in the GSM/3G/4G rabbit hole of standards.

I’m not sure if it required anything from the network, but my Siemens C35 could send faxes

GSM yes, but once phones went digital that capability was lost.

GSM phones are digital and include a special FAX mode.

One of my previous employees had a Kofax server with 6 ISDN lines for faxing. D in ISDN stands for Digital.

Try this online fax service: https://www.faxrocket.com/#!/start

I have bookmarked them from long ago.

Unsurprisingly Equifax requires you communicate with them through snail mail, fax or a telephone call.

Every other credit agency had no problem with my SSN + address then Equifax throws a flag, locks my account and says I have to validate my identity by faxing them identity documents.

Fat chance, idiots.

There are online services that let you upload a PDF, and they'll fax it for you.

Even in the 90s a lot of folks didn't send a "physical" fax, you could print it thru your modem. Or something similar, memory fuzzy, only did it once I think.

Or going to a shop like Kinkos or a local print/copy shop. They offered sending/receiving faxes or FaaS before _aaS was a term of "endearment".

In the Apple store you can find apps that send fax to a physical location. That's what I used the last time I had to send one.

There are quite a few multifunction printers with fax.

That assumes a land line to plug the fax machine into.

We have two.