So to anyone who has changed this codec are you seeing less battery life?
Thanks for all your inputs. I called Sprint. I spent 30 minutes with the tech, trying several options and we could not improve the call quality. Along the way, I asked her about the MLS, she gave it to me. She set up a ticket for me to take the phone to a service center. However, after finishing the call with the Sprint tech, I tried using the MLS and changing the set up and it worked. The instructions that I followed were:I will definitely confirm that calling Sprint and getting my msl # was worth it. Voice quality on both ends has improved. Sounds about as good as the Nexus S I returned within my 30 days to get this phone.