1

There is not any android call recorder works for your Galaxy S4 SGH-I337 phone, right? You must root your phone, install the latest version of Boldbeast Recorder, then
(1) if your phone has Samsung KNOX inside, please uninstall KNOX to use following settings to record:
- Record Mode: 24
- Record Format: AMR
- Tune Samsung 1: No
- Tune Samsung 2: No
- Tune Samsung 3: No
- Tune Audio Route: No
- Change Audio Controls: Yes
- Change Audio Driver: Yes
- Start Input Stream: No

(2) If you don't uninstall KNOX, please use following settings to record:
- Record Mode: 1, 4 or 5
- Record Format: WAV
- Tune Samsung 1: No
- Tune Samsung 2: No
- Tune Samsung 3: No
- Tune Audio Route: No
- Change Audio Controls: Yes
- Change Audio Driver: No
- Start Input Stream: Yes

Now it records calls perfectly in two directions.

2

Updated 2014-10-30

Thanks to several users, they told us indeed ATT Galaxy S4 SGH-I337 doesn't need root, see here http://www.boldbeast.com/forum/topic864 … eeded.html