I am using Fedora 9 with KDE4, I want to use tethering in it, so I pluged in my cell phone (RAZR V3c), it created /dev/ttyACM0, I set up kppp to dial that, it connects but I cannot find the correct login method so it dies on verifying user name and password. I know tethering works as I am posting this on windows using my phone as a modem.

tl;dr anyone know how to get tethering working with usb and KPPP?