- Dial ##7764726 (##PROGRAM) and act as if you were going to call that number.
- Enter 000000 for the SPC Password and then tap Verify
- Tap on "04 Vocode"
- Tap on EVRC-B than Apply
- Tap the Home Screen button and the phone should automatically reset a few seconds afterward. If not, power cycle the phone
Explanation - This changes how the phone compresses and decompressed the call audio which improves the quality.
Any one know about this?