ZyXEL Communications ZYWALL USG 20 Manual page 112

Chapter 7 Tutorials
Enable the interface and add it to a zone. It is highly recommended that you set
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the Zone to WAN to apply your WAN zone security settings to this 3G connection.
Leaving Zone set to none has the ZyWALL not apply any security settings to the
3G connection. Enter the PIN Code provided by the cellular 3G service provider
(0000 in this example).
Figure 60 Configuration > Network > Interface > Cellular > Edit
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
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"cellular" entry. When its connection status is Connected you can use the 3G
connection to access the Internet.
Figure 61 Status
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ZyWALL USG 20/20W User's Guide