Until now passengers only needed a valid ticket to enter the underground system. The local transport company is also introducing checks at the end of passengers' journeys and in future you will have to present a valid ticket if you want to exit the underground system too.
Fare-dodgers are prevented from exiting the system and are obliged to text 3304 to obtain a code to be able to get out. The text will set you back 6 euros.
The MIVB's Ann Van Hamme: "We're getting 20 texts a day. At the start there were even more. People need to get used to the new system and that's why we are giving people time and are carrying out tests at a premetro station."
The new system should be in place across the network by January.