- The AXE-10/ERICSSON system, the first fully digital telephone exchange, operated in Patras.
- Siemens EWSD, the first fully digital telephone exchanges (long-distance and hub), were installed.
- Partial operation of the first fully-digital international telephone exchange according to international communication standards (C.C.I.T.T).
- The Paging service began.
- The INMARSAT Land Earth Station at the Center of Satellite Communication in Thermopylae officially commenced operations.
- The New MT-20 International Electronic Telephone Exchange in Athens became operational.