I'm not sure if it occurred after I upgraded my iPhone 4 to iOS 6 but since some days I hear an echo of my voice when using the Apple headset on phone calls. It also seems that when I simply plug in the headset without calling or listening to music I hear some noise trough the earphones.
The echo is very annoying and it's almost impossible to use the headset for phone calls. Is there any solution or are there any other problem descriptions?