Since 31 March 2018, EU law (pdf) provides that all new models of cars being sold must have eCall technology. eCall is a communications system that automatically contacts the emergency services following a road crash anywhere in the EU. Anyone in the car can also make an eCall manually.
When activated, eCall makes a voice call to the emergency number 112. It also transmits data about the incident, such as your exact location and vehicle type. This allows the emergency services to locate you quickly and, if necessary, send an ambulance to help.
Read more about eCall on the website of the European Commission.