Are cell phones dangerous ?

For many years, they said that cell phones are dangerous especially when you talk too much in it. It's true that the cell phone is  useful tool when you have an emergency but don't hold it for long next to your head because the radiation emitted in it can give you cancer. The cell phones produce heat and there are claims that people have had brain tumors in the exact size, shape and position as the antenna on their cell phone. Scientific research suggests that cell phone may cause cancer, disrupt pacemakers, decrease fertility, damage DNA, and increase the risk of traffic accidents.