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Samsung Galaxy S5 Sport (Sprint) SM-G860P don't need root, the app records calls perfectly in two sides.

Android 5.0 / Android 4.4.2 please use these settings to record calls:
- Record Mode: 4
- Tune Audio Effect: No
- Tune Audio Route: Group3
- Tune Samsung1: Yes
- Tune Samsung2: Yes
- Tune Samsung3: No

Android 6.0.1 please use these settings to record calls:
- Record Mode: 1 or 5
- Tune Audio Effect: No
- Tune Audio Route: Group3
- Tune Samsung1: Yes
- Tune Samsung2: Yes
- Tune Samsung3: No