ZyXEL Communications ZyWALL USG Series Application Note page 86

Note: The Network Selection is set to auto by default. This means that the 3G USB
modem may connect to another 3G network when your service provider is not in
range or when necessary. Select Home to have the 3G device connect only to your
home network or local service provider . This prevents you from being charged using
the rate of a different ISP .
Go to the Dashboard. The Interface Status Summary section should contain a "cellular" entry.
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When its connection status is Connected you can use the 3G connection to access the Internet.
The ZyWALL automatically adds the cellular interface to the system default WAN trunk. If the ZyWALL
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is using a user-configured trunk as its default trunk and you want this cellular interface to be part of
it, use the Trunk screens to add it.
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