IIRC, using a Google Voice number for your 2FA was considered a security best-practice. Jack Dorsey himself got his account hacked via an SIM swap on a typical mobile carrier.
So of course Musk broke that functionality, presumably in the name of collecting personal data for exploitation.
https://www.engadget.com/twitter-google-voice-2fa-authentication-sms-195145660.html?src=rss
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