Not free, but it could get around signing up on a service that forces a non-VoIP number, but lets you change it later with less strict enforcement.
Like spambait throwaway email accounts, but visible to the world indefinitely. Shouldn't use with any service that allows account reset through SMS alone, or who has your real identity or payment info. Think: logins you would put on BugMeNot
Also:
https://sms-hero.com
https://textverified.com/free
[other paid services exist]
Paperwork, a personal document manager designed to make your life easier
This is the one I installed in the 90's on my home machine, and used in conjunction with fetchmail to retrieve messages over POP. Always the rebel, I had to try something besides mail and pine, and elm seemed too similar to both.
This FAQ provides answers to basic questions about Telegram.
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formerly used the Ring.To system
the performance setting and "colors and metrics" setting seem to make enough fonts pixelate.
no international service, but you could switch SIMs
The SMS option (playSMS.org) might be a starting point for developing a zero-trust 2-factor authentication gateway.