Visit Hotmail.com or Outlook.com Log in This select Account Settings This may or Options Select Account details Security & privacy Manage advanced security. Then enter the last 4 digits of your phone number in the email subscription. Send code Then wait for the SMS sent to the phone. Enter the code received via SMS. Submit
Visit Gmail.com Log in Select Settings Select Accounts and Import Select Change password recovery options. Choose Edit your mobile phone number. Select Country and Enter new phone number. Save Successful.