The EU data roaming limit is a limit that blocks your mobile data sessions when you have used more than €60.50 in roaming. This is a limit to protect you against high roaming charges abroad. You will receive an SMS when you have used 80% and 100% of your €60.50 roaming data limit. Your data roaming will be blocked until the end of the month if you have used 100%.
You can activate or deactivate this limit yourself in your application or in “My account” (https://wsc.undo.be/). Under “YOUR RATE”, click “MANAGE”. Then select “NETWORK SERVICES” then “LIMIT FOR DATA ROAMING IN EU” and enable or disable this limit.