The built-in error do to the microphone of the called phone goes off even if the called party does not answer.
The result is that the caller may intercept the call recipient.
also, the camera in the time on the phone, so that you can see the person before the answer, writes The Guardian.
This can occur if you press the shutdown button on the side of the phone when the call comes in, something that many do in order to dismiss it.
to the newspaper that they are aware of the problem and will update the software later in the week, in order to remedy it.