Babysitting probably isn't a great example, but cellphones affect the process of communicating so, unless you're expecting not to have the phone on you, it can actually be detrimental when you don't.
The main difference is that you tend to plan less up front. When our children were younger, and we had babysitters, we'd point out where the obvious stuff was but if they needed something, they'd just text. You just don't bother with the 15 min tour that I'd have got when I was doing the babysitting.
As a tangential, vaguely amusing, anecdote. A few years ago, my eldest's phone was a bit dodgy and kept cutting out. He was going to meet up with my wife in town but was meeting friends first. The two of them, my wife and son, spent about 5 minutes trying to work out how they could contact each other.
I, genius that I am, proposed a radical solution. I suggested that they arrange to meet at an agreed time and place. It had been such a long time since this was necessary that it hadn't even occurred to my wife (for which I still won't let her forget). My son had never, in his 15 odd years at the time, needed to do this.