The history of phone tech is "can we get more done with less joules?", while a pager is "you have one job".
Even when a pager is implemented on top of normal cellular networks like 3/4/5G, it's still better because there's nothing else on the system to drain the battery.
But it doesn't need to be on those systems at all, it can be an even less 'smart' radio receiver such as POCSAG system, on its own frequency, chosen specifically for getting though concrete etc., and disregarding any concerns about bandwidth because 1.2 kb/s is probably more than it needs.
I detect sarcasm, but yes, it does.
The history of phone tech is "can we get more done with less joules?", while a pager is "you have one job".
Even when a pager is implemented on top of normal cellular networks like 3/4/5G, it's still better because there's nothing else on the system to drain the battery.
But it doesn't need to be on those systems at all, it can be an even less 'smart' radio receiver such as POCSAG system, on its own frequency, chosen specifically for getting though concrete etc., and disregarding any concerns about bandwidth because 1.2 kb/s is probably more than it needs.