trunk call 
noun dated, chiefly British
A long-distance telephone call made within the same country.In those days you used to make a trunk call and sometimes we used to have to wait an hour for a line to be connected all the way down from Scotland....
- ‘If she doesn't come back, perhaps she would write again or at least make a trunk call,’ added Linda.
- There's no need these days to sit beside a telephone ‘waiting for a call’, or twiddle your thumbs waiting for a ‘trunk call’ to get through.