Bob makes a really good point.
I used to run construction work for a very anal guy, my father, back in the days before cellphones.
He would call several times an hour, with some detail question that popped into his head.
I could never get anything done.
So, one day, I stopped answering the phone, and he got in his car and drove to the jobsite to see why I wasn't answering.
We had a very intense "discussion". The gist of it was me telling him I couldn't work and talk on the phone at the same time, and that he needed to call much less frequently if he wanted me to get anything done. We wound up having morning and afternoon calls, and it forced him to make a list of stuff as he thought of it, instead of jumping on the phone immediately.
Cellphones, which I started using after I had my own business, are a double edged sword. I had a dozen for my employees at one time.
They do make communication easier. I limited minutes to 15 a day, so the employees paid for anything over that, to discourage chitchat on my dime.
The problem is, as the golfer Freddy Couples once said, when the phone rings there's probably someone on the other end who wants to talk.
And I needed work, not talk.