Codes to enter the programming menu can be found here:
How to Increase Droid X Call Quality
Relevant EVRC-B settings are under NAM CDMA Settings on the Incredible
I myself am not experiencing the call quality issue, so I can't vouch for the results. Link above indicates it may cause extra drain on battery. I used this same code years ago on a Samsung "dumb" phone and it did wonders for call quality and I did not notice a difference in battery life. YMMV.
How to Increase Droid X Call Quality
Relevant EVRC-B settings are under NAM CDMA Settings on the Incredible
I myself am not experiencing the call quality issue, so I can't vouch for the results. Link above indicates it may cause extra drain on battery. I used this same code years ago on a Samsung "dumb" phone and it did wonders for call quality and I did not notice a difference in battery life. YMMV.