[cmdauria]

I found this over at XDA. It really does work to increase call quality! If you need to get your MSL # just call sprint and tell them that you need to change from EVRC to EVRC-b. They will give you the MSL, no problem.

1. Go to Phone and Dial ##8626337#
2. Choose Edit Mode
3. Enter MSL
4. Change Home Orig., and Roam Orig. to EVRC-B
5. Hit Menu and Commit Changes

This is definitely not a placebo effect. Try it and see for yourself!