公衆 こうしゅう電線 でんせん もうでしょう
kōshūdensen mōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 公衆電線網

1. Probably on the public telephone network.; Likely via the public line.

Polite
Presumptive
Conjecture
Computing