There was a good episode of Planet Money where they interviewed some doctors who were trying to get rid of beepers at their hospital. Basically during testing, it was found that when using an app to send messages to doctors, it was almost too simple and non critical messages were being sent to doctors. This was creating a lot of noise and causing them to be overwhelmed and ignoring the notifications on the phone. It seemed as though the clunkyness of paging someone was a feature so that doctors on call were actually getting relevant information.