This Phone Number Has Already Been Used Too Many Times for Verification – Google
If you are attempting to verify a Gmail address using a phone number after signing in from a different location or from unusual activity, you may be surprised to learn that the phone number you are verifying with was used too many times already.
*Creating a new Gmail account with the same phone number
*Verifying current and old Gmail accounts with the same number
Read more on Google’s verification procedure here.
To get around the too many times limit - you can remove or update a phone number you used too many times with Google that is associated with your Gmail account by following this guide.
If you are trying to sign up a new Gmail address and don’t want to use phone verification, sign up using your mobile phone Internet browser.
If you continue to create Gmail accounts with the same phone number, Google suggests you use Gsuites.