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I just noticed that it's no longer available after I wanted to post a link to it here. Does anyone know what happened to it?

• _djo_ 14y ago
  The URL pointed to this text after it was shut down: Hi there – thanks for your interest in our phone-based login experiment. While we have concluded this particular experiment, we constantly experiment with new and more secure authentication mechanisms. Stay tuned for something even better! Dirk Balfanz, Google Security Team.