My work was using pagers up until around 2020, but went away from them due to some issues with finding replacement parts for the system or something. They were pretty handy since we would use them for alarm callouts. After them we went through an Ipod Touch phase, which sucked because they were wifi only which wasn't totally reliable across site and then we went to Ipads with more functions to allow us to do work orders as well and have a pager app but it had the same wifi issue which they eventually fixed by adding a bunch of routers across site, however now you were stuck carrying a big ass Ipad with a pager function. Current iteration is issuing Iphones to everyone, which comes with the same pager app which no one uses anymore, along with having cell and wifi for calling and teams.
All in all, a bunch of workarounds that work terribly compared to a simple pager. Most of which get bricked at each system update, and are a total pain in the ass to get working right through the various VPN, authentication, and work order apps.