[zzbn00]

No need to go as far as Africa. Basic landline telephones spread into poorer/more rural parts of Europe only in 1980s and 1990s. Until then it was either taking the bus to see people in person, or sending a letter....

E.g. quick search revealed this pamphlet from 1988 Spain, showing that ~30% of households did not at time yet have a telephone: https://www.telefonica.com/en/wp-content/uploads/sites/5/202...