How to Find the Cingular APN on a BlackBerry
- 1). Press the BlackBerry's menu key, which is located to the left of the device's trackpad or trackball.
- 2). Choose the "Option" menu from the list of icons displayed on the screen.
- 3). Choose the "Advanced Options" menu and navigate to the TCP/IP setting. The phone's APN settings as well as the APN username and password are displayed in the TCP/IP setting menu.
Source...