Mobile phone commercially available handheld mobile phone. From 1983 to 2014, worldwide mobile phone subscriptions grew to over seven billion—enough to provide one for every person on Earth. In first quarter of 2016, the top smartphone developers worldwide were Samsung, Apple, and Huawei, with smartphone sales represented 78 percent of total mobile phone sales. For feature phones (or "dumbphones") , the largest were Samsung, Nokia, and Alcatel. A handheld mobile radio telephone service was envisioned in the early stages of radio engineering. In 1917, Finnish inventor Eric Tigerstedt filed a patent for a "pocket-size folding telephone with a very thin carbon microphone".
Mobile phone overuse or electronic devices while driving. The significant number of injuries and accidents from distracted driving can be contributed at least partially to mobile phone overuse. There is currently no national ban on texting while driving, but many states have implemented laws to try to prevent these accidents. German psychotherapist and online addiction expert Bert te Wildt recommends using tools such as Offtime and Menthal to help prevent mobile phone overuse. Many smartphone addiction activists (such as Tristan Harris) recommend turning one's phone screen to grayscale mode, which helps reduce time spent on mobile phones by making them boring to look