I think I got a bit farther on my 8707V. Followed the instructions and it dials up fine, says "Registering computer with the network" and just hangs and then times out with the error "TCP/IP CP reported error 718..."
Log from the modem diagnostics shows:
06-19-2006 16:04:50.216 - Recv: <cr><lf>CONNECT<cr><lf>
06-19-2006 16:04:50.216 - Interpreted response: Connect
06-19-2006 16:04:50.216 - Receive Connect but CD was low, Waiting for signal to go high
06-19-2006 16:04:50.231 - After waiting 20ms CD is still low.
And then it just times out.
Apparently all of the rumor and/or hype about the 3G modem working through bluetooth is not correct. I can find nothing anywhere on this being supported. Hope I am wrong.