@silverchris could I trouble you to elaborate on how you managed to get yours working? All AT commands I've send via minicom showed OK, except for one which returned No Service. I've set the APN to vzwinternet for Verizon.
When executing comgt -d /dev/ttyACM0 I get:
SIM ready
Waiting for Registation... 120 sec max.....
Failed to register
The SIM works fine in my Verizon Jetpack.
Stumped.. wee hours of the morning.