First of all I just want to say that I completely agree with all of the technical things you talked about in his question but I think you kind of miss his question.
OP doesn't wanna be on SS7 (the thing that gives you your phone number), neither do I. I've just come to the conclusion that when it comes to infrastructure and paying for your goods SS7 is the only realistic option I have.
There is no distributed communication network anyone can just connect to. And the dream of leaving WiFi access points open for free (or for some kinda crypto-pay, e.g SkyNet) is just a dream, individuals have to invest in it and nobody wants to or take responsibility for it.
Here are some rules:
- Somebody* has to build the radios and computers that our phones connect to and has to build them all over the world (*doesn't have to be an individual, could be a company or government)
- You gotta pay to use it (whether it's with a billing account where they have your full name and house address, or crypto)
- It's gotta be the easiest option
If we can come with a solution that fits these rules we can do away with the SS7 cellular protocol and have a truly anonymous network.
He has one, he just doesn't sit in it