Someone *might* have tried to create an account on Google using your phone number, hoping Google would not check. Or someone is trying to impersonate you and get access to your Google account.
This article might help. Also read the comments :
https://krebsonsecurity.com/2016/09/the-limit ... authentication/
The Limits of SMS for 2-Factor Authentication
September 7th, 2016
got a call from this number. Said it was Google Account verifying my account and someone tried to sign it using my account and password. Gave me a code to use. WTF?
Someone *might* have tried to create an account on Google using your phone number, hoping Google would not check. Or someone is trying to impersonate you and get access to your Google account.
This article might help. Also read the comments :
https://krebsonsecurity.com/2016/09/the-limit ... authentication/
The Limits of SMS for 2-Factor Authentication
September 7th, 2016