In 1975 , the GPO transformed into the Zambian Post and Telecommunication Corporation ( PTC ) .
The first telephone exchange was installed in Livingstone , as part of the General Post Office ( GPO ) .
In 1975 , the GPO transformed into the Zambian Post and Telecommunication Corporation ( PTC ) .
The first telephone exchange was installed in Livingstone , as part of the General Post Office ( GPO ) .