I work in the Fire Industry, we've been selling LTE communicators for fire panels like hotcakes these last few years. Mostly due to so many sites not having good enough internet connections for IP-DACTs, or IT refusing to deal with fire alarm panels on their networks like putting us on a VLAN and giving us access to the outside world. I understand their hesitancy, but so many panels have built in IP communication with useful features now.

We're lucky enough that the vast majority of our clients moved off of 3G in this last wave of fire alarm system updates or they went straight from land lines to LTE as the land lines become less commonly used.

The most annoying thing is the sheer volume of spam mail I get from 3G advocates trying to convince us to contact regulators to stop 3G sunsetting. I'm sorry angry emailer, but we've long since moved on just like we always have when a technology gets put to pasture.