If you're having problems with an EeePC and a HUAWEI USB modem not wanting to connect, claiming
Failed to run pon. (pppclientservice.cpp: 1007)
pppd error (pppclientservice.cpp: 1005)
Delete the file: /var/run/pppd2.tdb
Press CTRL-ALT-T to get a terminal window and type
sudo rm /car/run/pppd2.tdb
Try connecting again and it should work. Else call your provider.