So what do you do when the pager goes off.
Do you run and find a pay phone?
Do you reach into your pocket for your cell phone?
What do you plan to do when the customer captures your cell phone number
and just calls you back?
A pager does have value because the coverage was nearly universal.
They are reliable.
A classic pager just displays numbers to call back or pre-shared code numbers.
The day I got a text/message pager that could give me a message "All OK" in contrast
to a call back number that was run to find a phone leash was like being released from
chains. It still took years to retrain managers and customers to send status hints in
contrast to a summons in the dark.
Mostly get a modern phone with a lot of battery life.
Car chargers are important to have.
Get a spare battery strategy.
Coverage... all cell coverage is not equal. Cell coverage has gaps that pager service does not.
One AC was right... pagers do not transmit so might be allowed inside when smartphones are not.
Camera... most repair folk now photograph the device serial number, make and model.
Some places prohibit cameras...
Political campaigns have gotten very automated and a smart phone will allow the party
to help you do what they want. The political tools allow a canvasser to know the registration
and names of folk behind the door at any address even geolocation with GPS. Vans driving
voters to the ballot places are able to pass over individuals registered for the 'other' party.
Make a list of the details and go shopping.