Form factor (mobile phones) in the context of "Feature phone"

A feature phone (also spelled featurephone), brick phone, or dumbphone, is a type of mobile phone with basic functionalities, as opposed to more advanced and modern smartphones. The term has been used for both newly made mobile phones that are not classed as smartphones and older mobile phones from eras before smartphones became ubiquitous.

The functions of feature phones are limited compared to smartphones: they tend to use an embedded operating system with a small and simple graphical user interface (unlike large and complex mobile operating systems on a smartphone) and cover general communication basics, such as calling and texting by SMS, although some may include limited smartphone-like features as well. Additionally, they may also evoke the form factor of earlier generations of mobile phones, typically from the 1990s and 2000s, with press-button based inputs and a small non-touch display.