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Re:Adding a phone number to your Google account can make it ... by baybal2 on Friday October 21, 2016 @01:52PM (#12762808)
They do that if:

1. You don't log in from a first world IP (the terminology from their user operations team), but previous logins were from them.

2. You registered from an IP in a country where they don't have access to sending SMS, but they go to a country where they have.

3. Bot detection algo flagged you, and bot detection algo are one of their crown jewels that they don't tell to support people.

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