Do smart phones still need screen savers and shells? Why?

I don't care much about screen savers. My mobile phone is available, but I still need a mobile phone case. I am a mobile phone photographer. Usually I go out with two mobile phones with different casings.

There are three main requirements for the mobile phone case.

1, thick enough

Because the lenses of many mobile phones protrude from the fuselage, it is very important to have a thicker shell in order to better protect the lenses from being scratched.

2. An external lens can be connected.

I usually separate housings for two mobile phones. The difference lies in the thread diameter of the lens, one is 17mm and the other is 13mm. These two calibers can meet almost most external lenses on the market.

3, must be black

The black shell has good light absorption effect, which can reduce the reflection on the glass when shooting through the glass.

The points I shared above are all for the sake of photography, mainly in terms of function. As for beauty, that is the second. If you also like mobile phone photography, you can learn from it.