General Management - Technical Services Vatican Telephone Service:
The Telephone Service of the Vatican State is responsible for the study, installation and management of the telecommunications infrastructure of the Vatican. It has been run since 5th July 1948 by devout members of the religious order of the Society of St Paul (la Società S.Paolo), employs over 30 laymen, a few priests and numerous nuns (suore Pie Discepole del Divin Maestro) who, on account of their distinct qualities of seriousness, reserve and in-depth knowledge of foreign languages are employed as operators in the day-to-day running manual switchboar
As a matter of fact, the network has very importance connections: " the first Italian link via radio connecting the Holy See and the Papal Residence at Castel Gandolfo".
Other facts about it here.