I dont. I live in Thailand right now, tomorrow maybe in Vietnam. Right now i might be a edge case but remote work is growing fast.

You can create throwaway SMS numbers for a few cents with several online providers, some even accept Bitcoin payments and dont ask for a name and Twitter accepts them happily. Its just the third party provider they use that did not implement that specific carrier yet.

Edit:// Also i am curious now why you think i had a thai phone number while living in switzerland? :D There are countries like austria that dont even ask for a passport for prepaid directly next to it, why would i go thai?

The "about" section of your website says you live in Switzerland.

At least here it's not legal for a mobile operator to give you a phone number if they don't have your ID (not even a prepaid number) so I supposed it was the same in the whole EU. Therefore I imagined you heard somewhere there's an operator in Thailand that lets you get a number without giving an ID, maybe even for free, so you wanted to get one to auth in Twitter. But such a system would be abused by spammers so Twitter had blocked that operator already.

Yes, quite the elucubration, I know.

Ah ok lol i see. I think i wrote "based in Switzerland" which mostly means thats where i store my desktop pc :) Actually in thailand, cambodia, vietnam and so on you also have to provide your passport. The only place that i know of that does not (until recently at least) is Austria. Most webservices dont require a passport tho, even for european numbers. But i have no idea about the legality so no idea.