I answered a call last night while in a very loud bar and i could barely hear the friend on the other side of the phone who also has a z10 and mid conversation he stops me to ask if i'm inside the bar or if i went out front to answer the call. I told him I was sitting right at the bar and he said wow, that noise cancelling works really well. He said I can hear background noise but I can hear you clearly, it sounds more like you're out front. I just thought that was pretty cool and people tent to make threads to ask about something that is wrong or to complain so there you have it. Noise cancelling