How does Sbeeper work?

You can send messages anonymously to an Sb number
Receiving messages in your Sbeeper account
Send via dial-in number (costs €1 per message)
Send via the www (to an Sb number for which Web Access is activated)
There is always a reception delay of 1 to 5 minutes for security during processing and shipping
With Web Access activation, Sb numbers can receive numeric and alpha numeric messages

How does a pager work?

A pager (also known as: beeper / beeper, pager, buzzer) is a device that can be used to send someone a signal or a text message. For this purpose, a pager is equipped with one or more telephone numbers, which can be dialed by the caller. In response to the call, the pager emits an audio signal, an indicator light flashes or a message appears in the window (depending on the capabilities and settings of the pager).

Source: Wikipedia