When using an iPhone with iOS 3.0 or higher and you can make calls, but cannot receive calls (may experience delayed tect messages as well), follow these steps:
- Tap Settings.
- Tap Mail, Contacts, Calendar.
- Tap Fetch New Data.
- Tap Push to OFF.
Note: There is no additional troubleshooting T-Mobile can provide for this issue. Contact the manufactorer if the problem persists.