Kurt Shintaku's Blog

For those of you with Samsung i760s on Verizon Wireless:
(This technically will work with many different phones but may require a different Service Code depending on the model)

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HOW TO CHANGE THE CODEC USED TO TRANSMIT & RECEIVE YOUR VOICE:

By default the codec used is Enhanced Variable Rate CODEC (EVRC). I believe the bandwidth on EVRC is 8kbs. By switching to the 13kbs Vocoder, call quality is theoretically better.
As taken from “Wirelessadvisor”:

The 13kbps Vocoder catches more of the nuances of a person’s speech and generally sounds a good bit better, but when there are errors in the bit stream it makes people sound robotic. The 8kbps EVRC codec is more efficient, but loses a lot of the nuances of speech. It is better at handling bit errors so it doesn’t make people sound so robotic or create the drastic shifts in tone that the 13kbps one does, but it does introduce the digital hiss that you hear in the background (it sounds like running water digitized at a very low bit rate) and when things get bad it drops frames (rather than creating such a dramatic shift in the speakers tone).

That being said, it appears that EVRC handles/keeps calls better in low-signal areas.

In case you wanted to change to the 13k Vocoder:

1. Dial **772
2. Enter the Service Code 000000 (six 0’s) and tap OK
3. Push the directional pad down until you see a screen that says:

SVC Mode NAM1
End of BASIC NAM
EXIT

4. Push the directional pad right so that "Exit" becomes "More"
5. Press the action button (middle of directional pad) to enter the additional settings menu.
6. Press down 1 time to get to the screen that says:

SVC Mode NAM1
Orig. SVC OPT
EVRC

7. The default is set to EVRC. To change to 13k Vocoder press right on the d-pad once.
8. Then press the action button once to save the change.
9. Finally, press the left soft key "Exit" to exit the service menu.