You may have to actually run the wizard for the second broadband card so that it will find it and recognize it. To run the set up wizard on your vz access manager follow the steps below:
Once you pull up the VZ access manager, click on the run wizard option to get the process started.
Welcome: Click Next to continue.
Wi-Fi/WWAN Detection: The setup wizard will first detect any availableWi-Fi adapters on your PC and then your Verizon Wireless PC Card.
Select WWAN device only if you do not have a Wi-Fi adapter configured
on your PC or want to skip the Wi-Fi detection.
Connectivity Options: After Wi-Fi/WWAN detection, you will need tochoose the connectivity option you wish to use with your Verizon
Wireless device. Select "PC Card", then click Next to continue.
Find Wireless Device: VZAccess Manager will now find your wireless