Voice Cloning App for Calls

I'm looking for an app that can clone voices during live calls for entertainment purposes. The app should work on both iOS and Android platforms.

Requirements:
- Ability to clone general human voices and custom voices provided by the user.
- High-quality, real-time voice modulation to ensure seamless integration during calls.
- User-friendly interface for easy setup and use.

Ideal Skills and Experience:
- Experience with voice modulation and cloning technologies
- Familiarity with mobile app development on both iOS and Android
- Strong background in audio processing and real-time communication systems

Please provide examples of similar work and relevant experience.