Hello! My name is*****
Please tell me if you are able to access "*****@******.***"? Do you know the password?
OK. Since you can access the account, you can easily change the phone number.
Do that by clicking on this link:
It will take you to the "Personal info" page. There click on the current phone number you see and you will be able to change it.
Let me know if you require further assistance.
Were you able to access the GMail account and change the phone number?
Let me know,
Let me know if you were able to receive my messages.