Roaming relates to a situation in which a customer of a mobile operator uses their phone when abroad.
Since the 15 June 2017, roaming rates have been regulated at a European level, and are now aligned with national rates (for reasonable use).
Operators are also required to be fully transparent. They are required to send their customers an information message concerning the prices for voice communications, SMS, and data from the first time the customers uses roaming services in a country.
Operators must implement an alert system to send a warning message to you when you have reached 80% of the limit of your internet volume, and when you reach your limit. This system helps prevent billing “shocks”. This protection mechanism does not concern voice and SMS services.