The built-in microphone on today's phones can be less than ideal for canceling the levels of road and wind noise present in a car at highway speeds, which leads to poor quality on the receiving end of your calls. Visor-mounted Bluetooth speakerphones feature more sophisticated microphones with noise and echo-cancellation technology located closer to your head, which can dramatically improve sound quality while you're on the road. Check out our current favorites for better call quality behind the wheel. ©2014 CBS Interactive Inc., a CBS Company. All rights reserved. Used by permission.