Sony Xperia Z2 records calls very well in two sides, no root needed.
Android 4.4.2, 4.4.4 and 5.0.2 please use these settings to record calls:
- Record Mode: 4
- Tune Audio Effect: No
- Tune Audio Route: Group3
Android 5.1.1 please use these settings to record calls:
- Record Mode: 1 or 5
- Tune Audio Effect: No
- Tune Audio Route: Group3
Sony Xperia Z2 D6502, D6503, D6543 all work well.