予よ報ほう音おん

noun

telephone time-warning sound

A tone or announcement played during a phone call to indicate remaining time or approaching time limit, often heard on public payphones or calling cards.

• 公こう衆しゅう電でん話わで通つう話わ中ちゅうに予よ報ほう音おんが鳴なったら、すぐに追つい加か料りょう金きんを入いれてください。

  If you hear the time-warning sound during a call on a public phone, please insert additional coins immediately.