I can't wait to have a phone without a number.  Nobody, and certainly no online service, "needs" to reach me by mobile.

Unfortunately many websites are in the dark ages when it comes to SMS for 2FA.

I'm still looking for a good service provider who can provide an online SMS service for this..

The no UDP limitation is for their $5 relay service. The phone service (anonymous IMSI) does not have that limitation. But the phone service is unlimited data-only, which is a problem if you need to be reachable by a phone number.

DeezSats

This is the best news I've heard in a while.  I hope it's legit and commercially sustainable.

There are limited details on the website.  They do have a limited presence on linkedin:

Very curious to know more about this, the technology, and the service offering(s) - such as full list of countries, technologies, restrictions etc.

No UDP over port 443, I'm presuming TCP is supported though else there'd be no TLS

bitcoin

Pretty Good Phone Privacy

This is the best news I've heard in a while.  I hope it's legit and commercially sustainable.  

There are limited details on the website.  They do have a limited presence on linkedin:

https://www.linkedin.com/company/invisv/people/

Very curious to know more about this, the technology, and the service offering(s) - such as full list of countries, technologies, restrictions etc.

No UDP over port 443, I'm presuming TCP is supported though else there'd be no TLS