Can't find a number or email address in the CERN phonebook? Try these options.
For a detailed search try the CERN phonebook.
Central telephone exchange:
Visits reception desk:
CERN Service Desk
CERN internal telephone numbers
These are five-digit numbers, all reachable directly from outside CERN.
Example: to call internal number xxxxx from a telephone in Belgium, dial 00 (to get out of Belgium) then 41 (country code for Switzerland) then 22 (area code for Geneva) then 76 (the first two digits of all CERN telephones) and finally xxxxx. Note that not all countries use 00 to dial internationally.
CERN mobile phone (GSM) numbers
CERN mobile phone numbers are of the form +41 75 411 xx xx.
To call a CERN mobile from outside CERN, dial as if you were calling the Swiss number (+41) 75 411, and the last 4 digits of the mobile number.
Example: To call the mobile number 161234 from the US, dial 00 41 75 411 1234.
Note that this can only be done by authorised personnel. If the information concerning your group or department is incorrect, contact your secretariat.
When dialing from within CERN and ending up in an external company's robot, you may be asked to select a service by pressing certain digits. This will fail unless you press 98 before the digit. Example: "to contact customer service, press 2" should be reacted to by pressing 982 and not just 2.