How to change the healthy background of iphone to black?

1. First open the settings and find GM. There are many hidden small functions in GM, so you can look for them if you have nothing to do.

2. Then find the auxiliary function;

3. There are display adjustments in the auxiliary functions, so click in;

4. Then find the inverted color;

5. After clicking in, the point intelligence turns black;

IPhone is a series of mobile phone products with iOS operating system launched by Apple from June 5th to1October 9th, 2007.