Verizon does not offer a manager application that will run on OS X 10.8 64bit for the Pantech modem. Here is how you can use the device on Mountain Lion. Make sure you have the devices phone number before starting;
1. Install device
2. Go to system preferences, network and select device
3. Phone number = #777
4. Account number = ##########@vzw3g.com
5. Password is vzw
6. Click advanced
7. Under modem tab select vendor sierra
8. Model CDMA
9. Check error correction and compression in modem
10. Ignore dial tone when dialing
11. Dialing = Tone
Complete!