ATT provides you with one of the best services but sometimes you do face issues like ATT mail not working. You may encounter some log in issues or problem with connectivity. Sometimes the voice mail doesn’t work or the service is unavailable. Incomplete set up of voice mail can also be the reason why AT&T is not working. You can resolve these issues by going through some common troubleshooting steps. If might be that AT&T connection not secure. Switch off your phone for few seconds and switch it on. Contact the company for further issues.