Recovery email in Gmail.

   Add or change a recovery phone number

1. On your Android phone or tablet, open your device's Settings app  Google  Google Account.
2. At the top, tap Security.
3. Under "Ways we can verify it's you," tap Recovery phone. You might need to sign in.
4. From here, you can:
   • Add a recovery phone.
   • Change your recovery phone: Next to your number, select Edit .
   • Delete your recovery phone: Next to your number, select Delete .
5. Follow the steps on the screen.

Note: Deleting your recovery phone number doesn’t delete it from being used for other Google services. Go to your account to manage your phone numbers.