Re:Tell HN: Slack decides to close down IRC and XMPP gateways
by ForHackernews on Thursday March 08, 2018 @05:04AM
(#16543448)
Google Voice will let you pay $20 to "buy" a phone number (either a GV number they assign, or another number you port in), which is then yours forever (subject to Google's arcane EULA, I'm sure).
The cheapest I've seen slightly below $2/month, but all the super cheap carriers are very volatile businesses and you can't expect to keep them more than a few years.
Seeing as you don't really own phone numbers in the sense you own domain names, any permanence is limited by the life span of your service provider.