I have noticed phones with a handset (like the one in the image) have a little cover that resembles something like a cold camera shoe under the bottom of the handset’s top speaker holder. Is there a use for it? It has a line bump in the middle, but it doesn’t go all the way from both sides, it leaves a gap. I have also seem some of them have extra space on the top of the cover, and some don’t.
So that’s how you used the old hand crank phones, I never know. I thought you turned the crank to get power into the phone and then told the person working the switch bord who you want is to talk to. And that when you were telling you sometimes needed to re turn the crank to get more power.