How can I change the background color when making a call ?

[Royi]

When I make a call , I see a background which is changing ( gradient)

How can I remove/change/disable that background ?

Example :

https://i.stack.imgur.com/zBPfL.png

 

[SpookDroid]

The only way to change the dialer's background is to use a Theme that supports it. There are no stock settings to do so.

 

[pizza_pablo]

The only way to change the dialer's background is to use a Theme that supports it. There are no stock settings to do so.

The OP is not referring to changing the dialer, but the background color of the IN CALL screen, like the one pictured in the OP.

 

[CraftyMe2323]

You can't...