I'm a new 8700c user and deaf as well. I encountered the same problem.
You will need to set your TCP settings as:
APN: wap.cingular
Username for APN:
![[email address]](http://www.blackberryforums.com/?emailimage=926ba5063332a843f899526b95997cb8)
Password for APN: CINGULAR1
If that does not work, you will need to call Cingular (800-304-3044) and ask them to enable your TCP access and activate Data Connect on your device. Assuming you have unlimited data, they should not incur any additional charges.
IP-Relay now works for me just fine. Hope this helps.