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Re:Twitter forces all new users to enter a valid phone number by brownbat on Monday March 25, 2019 @10:00PM (#19488653)
Sites that require phone number verification often block numbers allocated for VoIP services for fear of spammers. YMMV if you've tethered your GV number to a physical device at some point.

I've run into this semi-frequently over the years, and it's always extremely frustrating when it happens, but somehow I can't remember exactly where either.

Old references online point to Facebook, Line, and Snapchat: https://www.reddit.com/r/Googlevoice/comments/3uv3mt/google_...

Re:Twitter forces all new users to enter a valid phone number by elektor on Monday March 25, 2019 @11:11PM (#19488969)
I can back this claim up. I was unable to verify my Citi credit card over the phone using my Google Voice number, they insisted on a non-VoIP number which ultimately delayed the verification process by a week.
Re:Twitter forces all new users to enter a valid phone number by o10449366 on Tuesday March 26, 2019 @12:53AM (#19489393)
FWIW I may have just signed up at the right time, but both my Facebook and Snapchat are tied to my GV number and I've never had any issues.