Hmmm today is the first day of few that I have put the Otterbox Commuetr Case back on mine and so I will check to see if Mine is crackily or muffled as well. Without the case the speaker, bt headset they are crackily.
Thanks for the response. I dont have a cover or skin on the phone but i'll give it a bit of a wipe and a clean to see if that makes a difference. Any other ideas?
Personally, I would return the phone for an exchange. There is no reason to expect anything less than perfection regarding sound quality. My 9900 is perfect in this regard.