Actually, in many countries, the pager infrastructure has been shut down. Where I live, the pager infrastructure was turned off around ten years ago. Nobody cared.
Are you sure you're not confusing that with analog cell service? That has indeed been shut down in most places, with very, very few exceptions globally (mostly in extremely rural areas where people haven't wanted to go to satellite service). Pager frequencies in a lot of places is still going very strong, for precisely the reasons indicated in the discussion.
That's even moreso the case depending on government needs in your jurisdiction. If there are Important Civilian Responsibilities, then the pager network likely still works, since they're probably not using milcom but may need to function when the cell towers are out.