From Toby Pereira, Rayne, Essex, UK
That apps, even when “off”, can spy on you through your phone's microphone without your knowledge, (5 November 2016 p 22) is disturbing. The simplest and most obvious protection would be for phone manufacturers to include physical on/off switches for microphones and cameras. That way users can ensure these input devices are only on when you explicitly want them to be. Similarly, a physical on/off switch for the whole phone would be much safer and more reliable.
