A feature phone is a mobile phone that retains the form factor of earlier-generation phones, with button-based input and a small display. Feature phones are sometimes called dumbphones in contrast with touch-input smartphones. They tend to use an embedded operating system with a small and simple graphical user interface, unlike large and complex general-purpose mobile operating systems like Android or iOS. Feature phones typically provide voice calling and text messaging functionality as well as basic multimedia and Internet capabilities and other services offered by the user's wireless service provider. Feature phones have a backlit LCD screen, a hardware notification LED, and a micro-USB port and have a physical keyboard, a microphone, an SD card slot, a rear-facing camera to record video and capture pictures, and GPS. Some feature phones include a rudimentary app store that includes basic software such as mobile games, calendars, and calculator programs. There is no doubt that the most popular feature phone of all time in Bangladesh is the famous Nokia 1100. Some may still remember the old ringtone and snake game from this phone with the highly impressive build quality, long battery life, stylish design, and the comfortable feeling of holding it in hand.