公衆 こうしゅう電話 でんわ もうでしょう
kōshūdenwa mōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 公衆電話網

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

Polite
Presumptive
Conjecture
Computing