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You can limit your data usage when abroad by turning off data roaming. You'll then not be able to access the internet using the mobile network when abroad. Remember, you need to establish a connection to the router web interface.
1. Find "Connection"
Click Mobile Broadband.
2. Turn data roaming on or off
Click the drop down list below "Connection mode".
Click the field next to "Automatically connect even when roaming" to turn the function on or off.
3. Save settings