SUCCESS.

I just changed my phone number with my US banks from the old one to the one I got from jmp.chat.

The first bank doesn't seem to care much and just took my word for it. The second one (Wise US, who are becoming an increasing unbearable pain in my ass these past couple of years), of course did, and sent me an sms confirmation code. Which I perfectly and smoothly received via the Dino app on my desktop computer running Linux.

The complete set up is:

1. Get a Jabber network ID. In my case, I used movim.eu to get one.

2. Get a Jabber-able app. First I tried an iOS app, and was unable to make it work. Then I tried Dino on Linux desktop and it worked perfectly.

3. Set it up with your Jabber ID.

4. Go to jmp.chat and pick a phone number, and follow the instructions.

Everything is done through the Jabber client via chatbot and there's no other way to reach them, but there's a chat group and once you've started the registration (i.e., once you've paid), there are actual humans on the other side of the line.

The most amazing part is that the service costs $4.99/month.