Alert: For Samsung Galaxy S3 running Android 4. 2. 2 user, please upgrade to Android 4. 4. 2, otherwise Call Recorder might not work. Tip: Galaxy S5 on Kitkat, Galaxy Note3 running Andriod 4. 4. 2 configurations: go to More Settings and adjust Audio Source: Voice_Call, Sample rate: 11Khz and Format: MP4.