Jolt is the best phone calling app in the play store that allows you to change your call background. It provides you with a personalized experience and allows you to customize the way you answer calls. The app is highly customizable, allowing you to change the background color, font, and wallpaper.

The app is highly functional, and provides you with various options. For instance, you can set your own background or select one from the provided image gallery. It also allows you to customize your phone's theme. The theme can be set to a particular color or font.

Jolt is highly functional and customizable. The app provides you with various options that you can use to enhance your experience. It allows you to set the background color, wallpaper, and font.