If an end user gets a message such as "Calling phone numbers is not possible." an error code that could give an indication of why calling fail would be more helpful with troubleshooting the cause than the current generic message. A screenshot of the error message has been uploaded. In this case a simple error code number that could be reference would have been more helpful then having the user close the app and restart it. Knowing the cause for the error could help prevent customer annoyances in the future.