In 1992 or 1993, I bought a "refurbished" pager, I can't remember how much the hardware cost me, but the monthly service fee was $9.99 US. It was a simple plastic box that had an on/off switch, a two-setting function switch, LED
display screen that showed about twelve characters, a red notification light, a clip to attach it to the belt or waistline, and it ran on two AAA or AA batteries.
Its only functions were that if someone called my number, he or she (ok, she, because this is Randy D we're talking about) would hear my greeting message and then be prompted to either leave a phone number for me to call back, a voice message for me to listen to, or both.
If she left her number, it would scroll on the LED display screen until I acknowledged it, at which point it would stop scrolling and just remain there. If another call came in before I acknowledged, each number would scroll in turn, accompanied by an indicator in parenthesis showing the order of the calls (1, 2, 3). If she left a voice message, the indicator light would flash until acknowledged. Subsequent voice messages would be separated by three quick flashes in succession, then two slow flashes, then three quick ones. The beeper didn't vibrate or ring, so bright sunlight would prevent me from noticing the light. I would have to seek out a pay phone, call my service to return the call or to listen to the voice messages.