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.
If you dont have that white thing on your nails you should see a doctor, you are missing something vital from your diet.
If you don’t recognize it I would suspect your entire family is lacking something it needs in its diet. All healthy people have it.