Mobile coverage at CERN is assured by Swisscom in Swiss territory and by the French operators in French territory:
- Swisscom coverage in Switzerland can be consulted here.
- Orange France coverage map can be found here.
- Underground facilities are covered by Swisscom even in French territory.
- Meyrin site (French and Swiss areas) is covered by Swisscom.
While traveling around the world, you call from anywhere except for North Korea and Eritrea. Please, refer to this link for information about the applied tariffs.