I actually DID notice a noise cancellation "issue" with mine. I bought the black rubbery case from AT&T for it, and was on the phone once and my friend said that my audio all of a sudden sounded muffled or garbled. I played around with it, and determined that I was holding the phone with my shoulder against the back of it to hold it to my face. When I covered the camera and speakerphone holes on the back of the case with my shoulder, that's what made the difference. I assume maybe one of the speakerphone holes has a mic in it? I don't know. I had to try really hard to get it to "mess up" so I never worried about it.