How does pager work?

How does a pager work?

Beep beep beep! Beep beep beep! Before the days when cellphones started interrupting our lives, there was another form of instant messaging system called paging. Mobile phones have made pagers less popular than they were in the mid-1990s, but paging (or radio paging, to give it its full name) is still a vitally important form …

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