Call Voice Changer is an Android app developed by KRK VISION that allows users to change their voice in real-time during phone conversations. This free app is a fun way to add some excitement to your phone calls, as you can choose from a variety of sound effects to apply to your voice.

The app is easy to use, as you simply select the sound effect you want to use and then make your phone call as usual. Some of the sound effects available include a robot voice, a helium voice, and even a Darth Vader voice. The app also allows you to record your calls, which can be saved and shared with others. However, it's important to note that recording calls without consent is illegal in some countries, so be sure to check your local laws before using this feature.