Form factor (mobile phones)
The form factor of a mobile phone is its size, shape, and style, as well as the layout and position of its major components.
A Nokia E51, a typical bar phone
Sony Ericsson W800i, released 2005
Nokia 7600 in an unusual bar shape
Palm Treo 650
Form factor is a hardware design aspect that defines and prescribes the size, shape, and other physical specifications of components, particularly in electronics. A form factor may represent a broad class of similarly sized components, or it may prescribe a specific standard. It may also define an entire system, as in a computer form factor.
Comparison of some common motherboard form factors (pen for scale)
Size comparison of various mobile form factors (from smallest to largest: Nintendo DS Lite handheld, Asus Eee PC netbook, and MacBook laptop)