I have a Verizon Pantech PC5750 WWAN card. Been using it for about a year or two now. EVDO RevA so nice and fast when available.
There was a VZAccess update (to 7.3.11 I think) and once I did the update, I started getting a 633 error. I cannot find standalone drivers or firmware newer than I have, to try that kind of update.
Hard to find any good solutions using the Google.