Wake-up call (service)
Encyclopedia
A wake-up call is a service provided by most lodging establishments to provide a service similar to alarm clock
Alarm clock
An alarm clock is a clock that is designed to make a loud sound at a specific time. The primary use of these clocks is to awaken people from their night's sleep or short naps; they are sometimes used for other reminders as well. To stop the sound, a button or handle on the clock is pressed; but...

s via a telephone
Telephone
The telephone , colloquially referred to as a phone, is a telecommunications device that transmits and receives sounds, usually the human voice. Telephones are a point-to-point communication system whose most basic function is to allow two people separated by large distances to talk to each other...

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The phrase has been used to describe a sign or warning that alerts one to negative or dangerous behavior or circumstances. In east Asia, a wake-up call is commonly known as a "morning call."
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