What makes people think their phone calls are private when they talk outdoors?

Where do you suppose people get the idea that when they use the phone outdoors, they are less audible than inside? With no walls to stop it, the voice carries very well, especially since people outside tend to use their outdoor voice.

I can tell you what kind of pizza the woman across the street orders and what the man next door says to his girlfriends in the privacy of his backyard. In summer I have to keep my windows shut if I don’t want to be privy to his social life.

My son steps outside to have a private conversation and I can hear every word. I wish he’d just go to his room.

Can’t people figure out that if they can hear others shouting into the phone at the beach, in the store, and on their front steps, we can hear them too?

I, for one, would rather not.