Setps to Add Recovery mobile phone number
1.First Sign in to My Account.
2. go to the "Personal info & privacy" section, select Your personal info.
3.Select Phone.
From here you can:
a. Add a recovery phone: Under "Recovery phone," select Add recovery phone.
b.Change your recovery phone: Next to your phone number, select Edit Edit. In the box that appears, choose Update number.
4.Enter your phone number and follow the onscreen instructions.
Add or change a recovery email
1.Sign in to My Account.
2.At the "Personal info & privacy" section, select Your personal info.
3.Select Email.
4.From here you can:
a.Add a recovery email: Next to "Recovery email," select Add recovery email.
b.Change your recovery email: Next to "Recovery email," select your email address.
5.Enter your recovery email address.
6.Select Done.
Ref From : https://support.google.com/accounts/answer/183723?hl=en for your information
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