Telephone used by the illegal CID

After the Germans cut off all normal telephone connections at the end of October 1944, the illegal CID (Central Information Service) created direct connections between the CID exchanges by welding cables together. Antique telephones without dials were used to make these direct connections. Four of them hung in the CID office in Utrecht. This enabled Prince Bernhard to make contact with the BS [Interior Forces].

Maintaining resistance contacts
During the last winter of the war, resistance grew in spite of the oppression. The railway strike made train transport impossible, so bicycle courier services were set up. The telephone also played an important role in maintaining resistance contacts.
Technicians at the Dutch public telephone company (PTT) set up connections outside the normal telephone network.