I used one in 2019 when my wife was pregnant.

I work in secure facilities where I can’t have any phones, smart watches, anything with wifi, microphones, etc. However, pagers are allowed since they receive only.

I was also pretty mobile, moving between buildings so calling my desk phone was very unreliable.

The pager service I got had an email gateway so my wife could either text or email messages to it.

I set up 2 iOS shortcuts to send emails. One said “call me when you can” and the other said “call me NOW”.