I posted with this problem some time back where telecom mobile with Sierra watcher and even direct dial works for a while then seems to go into sleep mode from whence it cannot be recovered. I have tried drivers off the Sierra site, the original telecom drivers, direct dial with and without the Sierra software and any number of such combinations you like to name.
Telecom's most recent offer - and a decent one it was too - was to try a new card. So - rip out all the old software, complete reinstall with new aircard... result? Smae old same old.
Driving me nuts... anyone?
Cheers
Brent