The cell phone was patented in 1917 by a Finnish inventor named Eric Tigerstedt. Tigerstedt was often called "the Thomas Edison of Finland." You can tell the two apart, though, because it was Thomas Edison, not Eric Tigerstedt, who lied about the cause of his deafness: Edison, late in his life told people he was deaf because he'd been helped onto a train by a conductor who lifted him by his ears.
Although right now many people are focused on the fight between the FBI and Apple -- and more people don't understand why that fight is important -- it's equally important to note that for over 10 years the FBI has had the ability to remotely turn on the microphone on your cell phone to listen in on you even when your phone is turned off.
Even if the software isn't on your phone right now, it can be remotely installed by the company that made your phone.
Over 60 law enforcement or government agencies in the United States are known to have "stingray" devices -- a tool that simulates a cell phone tower and intercepts (and can record) every cell phone conversation (or data point) passing through it.
Those are the ones that are known. Most government agencies don't let people know whether they have a stingray or not.
Thomas Edison said "Just because something doesn't do what you planned it to do doesn't mean it's useless."