TP-Link XN021-G3 - Page 101

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Chapter 10
USB Settings
3. Tick the checkbox to enable 3G/4G as a backup solution for Internet access.
4. Tick the checkbox to set the Dial Number, APN, Username and Password manually.
Note: The following Advanced settings will only display if you enable 3G/4G as the backup solution for Internet access.
5. Click Save.