What to do when ATT email is not working on iPhone?
- Check the network connection: Make sure your internet settings are switched on or you are connected to a working Wi-Fi network
- Check the email account settings: Open your email account from a PC and check all the settings and permissions to make sure you can access your mail from an iPhone.
- Scan for updates: Scan the phone for any software or application updates that need to be completed.
Read More: http://www.email-loginhelp.com/at&t-email-login.php