Ease of separation between critical and non-critical functions? I.e at night smartphone should have notifications disabled, but pager should not (when on duty).

Ease of separation between critical and non-critical functions? I.e at night smartphone should have notifications disabled, but pager should not (when on duty). And smartphones are so power hungry that keeping them charged can be a hazzle, especially in a stressful environment where one might want paging. But yeah, likely going to be specialized situations this fits for.