A decade is a long time in technology terms.
In 1980, there were only about 3 million pagers in use worldwide. By 1989, they were much more common, but they didn't really hit their heyday until the mid 90s. Since then, they have gradually been overshadowed by cell phones.
If you're in 1980, then you're probably talking on-call doctors and emergency workers, and others with truly urgent time-sensitive work. By 1989, they still weren't as ubiquitous as cell phones are today, but they were fairly common.