v0iceM4sk Use speech-to-text and text-to-speech to anonymously mask your voice in android phone calls Resources Text to Speech https://developer.android.com/reference/android/speech/tts/TextToSpeech.html https://stacktips.com/tutorials/android/android-texttospeech-example Speech to Text https://developer.android.com/reference/android/speech/SpeechRecognizer https://stacktips.com/tutorials/android/speech-to-text-in-android https://github.com/Truiton/CustomSpeechRecognizer