Here are two tips for better call quality:
1. Go to menu > settings > call settings and turn off voice privacy. Quite often this causes an echo for someone else on the other line.
2. This next tip might not always work, depending where you live...so if your call quality gets worse after trying just change it back...go to the dialer and on the standard phone screen type ##PROGRAM and enter 000000 when it askd for the password. Then choose VOCODE. the default is EVRC. Try changing this to ERVC-B. This is a newer call standard that isn't completely in effect yet....also you can try 13k which is the oldest of the standards. Let me know how it works.
