I'm running a Moto H500 with BB 7290 OS 4.0.2.

At lower highway speeds, no complaints from either end - volume is adequate on my end, and no complaints from the other end. At higher speeds (> 100km/h), it becomes difficult to hear the other party over road noise, and the other party complains that I sound like I'm in a tunnel. Haven't tried yet with Encryption off - anyone think that'll make a difference?