PA State Forestry was a telephone company until 1969

Fire Protection

Exclusion of fire from the state forest was recognized very early as
an important part of scientific forestry. Thus, part of the early
development was the selection of convenient trees as lookout points
for forest fire detection. These trees were later replaced with
wooden, and eventually steel, observation towers.

Telephone lines were built to provide communication between fire
towers, offices, and other points in the forest. Often persons living
along these lines were permitted to hook onto them (free of charge)
and soon the department found itself in the telephone business. The
confusing situation lasted until 1969 when the Bell Telephone Company
took over the last of these lines

from https://elibrary.dcnr.pa.gov/GetDocument?docId=1753390&DocName=dcnr_20033593.pdf