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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 "Internet Connection"
Click Mobile Network.
Click Internet Connection.
2. Turn on data roaming
Click the indicator next to "Data roaming" to turn on the function.
3. Turn off data roaming
Click the indicator next to "Data roaming" to turn off the function.