I know people who carry old fashioned pagers, and have done so for years. Yes, they also have smart phones, but cell service in many places is shit, and pagers have been part of the support infrastructure forever.
And, believe it or not, people still use land lines too. I know it's shocking to the kiddies, but it's true.
Do you people all think this technology became obsolete because you can get a freakin' app?
Where I live your chance of cellular coverage is iffy, and I'm in the burbs, just in a spot with bad coverage.
My wife's stupid fucking pager? Still keeps working.
What you have to ask yourself, is do you want to get paged in the middle of the night, and just how much do you plan on charging for that privilege? Everyone I know who carries one is getting a premium just to have it, and an hourly rate in the event it goes off.
Otherwise, carrying one is the stupidest idea you can imagine, and people just assume you work 24x7. If you do that, well, you're a sucker.