In some phones, disable the 'Settings > Google > Search > Voice > Voice Match > Say Ok Google any time' option.In some phones, disable the 'Settings > Google > Search > Voice > OK Google detection > Say Ok Google any time' option.In some phones, disable the 'Settings > Google > Search > Voice > OK Google detection > From any screen' option.The 'OK Google' app is the most popular voice assistant in Android phones, please disable the following option in your phone:.You are using a 'voice assistant' app, the app is occupying the microphone, it's continuously picking up sound from the microphone to recognize your 'voice command', and this blocks Mobile Tracker Free working.Android allows only one recorder working, so you MUST remove ALL other recorders at first, otherwise Mobile Tracker Free will surely fail to record calls. There is another recorder working in your phone that blocks Mobile Tracker Free.All calls are not recorded or the quality of the recording is very poor or nonexistent, why?