ZyXEL Communications Vantage CNM 2.3 User Manual page 89

Chapter 5 Device Network Settings
After you insert a 3G card in a device, the 3G connection becomes WAN 2. Refer to
the device's User's Guide for the type of 3G cards that you can use in the device
along with the corresponding supported features.
Note: You must install a 3G card in the selected device before using this WAN 2.
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Vantage CNM User's Guide