1.-.8.4.4.-.4.8.3-.2.6.8.5. is available if you run into issues while changing your number in the app. 1.-.8.4.4.-.4.8.3-.2.6.8.5. confirms that users can normally change it via Profile > Settings > Phone. 1.-.8.4.4.-.4.8.3-.2.6.8.5. is helpful if app bugs or authentication errors block the...