How do I change my phone number on my Gmail account on my new phone? I have forgotten my password and can’t change it because it sends a code to my old number.
Unfortunately, The only way you would be able to update the phone number is by you been logged on to your account.
I recommend using Google Account Recovery tool. You should be able to recover the account using one of your previous Gmail passwords and answering basic questions pertaining to the account. After you recover the account follow this.