Why are old cell phones an environmental concern?

Why are old cell phones an environmental concern?

John Shegerian (CEO, Electronic Waste Recyclers) gives expert video advice on: What is 'hazardous waste'?; Why is my old TV considered hazardous waste?; Why are the plastics found in e-waste dangerous for the environment? and more...

Old cell phones, again, like other types of electronics, contain trace amounts of lead, arsenic, and other harmful elements that, if it comes in contact with human beings or animals or the environment, it can harm our central nervous system and create deformities and other problems in people or animals.