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I've had problems using Twilio numbers to create Google accounts. I think voice activation does work, but you need to forward the number to your own number.

• hirsin 8y ago
  It should be assumed they check the phone number provider and block twilio as a spam prevention technique.
  • JoshMnem 8y ago
    How can they detect Twilio numbers but still let scammers robocall my phone on a daily basis via bandwidth.com's API?
  • jstanley 8y ago
    Even where this doesn't happen, Twilio block messages of the form "Your Google verification code is 123456" so you can't receive them anyway.