Can't speak for the other person, but my company has a landline at my office, and I'm not expected to be a the beck and call of my employer when not working. And if they want to get in touch with me for any reason, they can call me at home.

I do have a smart phone and use every feature of it regularly. I love it. But it's not essential to me, just a damn convenient and entertaining appliance. But not essential, for me.