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. You can still use Wi-Fi even though data roaming is turned off.
Step 1 of 4
Find "Mobile Data"
Tap Settings.
Step 2 of 4
Find "Mobile Data"
Tap Mobile Data.
Step 3 of 4
Turn data roaming on or off
Tap the indicator next to "Data Roaming" to turn the function on or off.