The Pantech modem was originally activated on a windows box about a year ago. I used it in a cradlepoint router for most of that time but got lots of disconnects from the router. Then I bought a LG VL600 from ebay with no SIM card and moved my SIM card into the LG modem and then updated the IMEI or MEID at verizonwireless. This worked a little better but still disconnected. I had to throttle it to lower than 3G speeds to keep it connected. Apparently the USB device on the cradlepoint can't handle high speeds very well. That is why I decided to put it in my linux box and use that as the router.
I couldn't get the LG device to connect so I moved the SIM card back into the Pantech. And you know the rest of the story after that. The only difference is that i didn't update verizonwireless this time with the correct device ID that is being used with the SIM card. Verizon still thinks I have a LG modem rather than the Pantech. Maybe they detected that and turned off my 4G access?