Old school phone

They would have grown up with this icon or a similar icon as the phone app. So they will just automatically. assume its a phone, as its a "phone" app. But they probably wouldnt question it anyway, as its just a logo.

Kids will not know what it means to say " I only have 2 bars of battery left"

Kid these days don't know what the save icon on Windows computers is. I expect it will be similar.

They could think it's sort of a lopsided smile.