The form factor of a mobile phone is its size, shape, and style, as well as the layout and position of its major components. There are three major form factors – bar phones, flip phones, and sliders – as well as sub-categories of these forms and some atypical forms.
Bar
A bar (also known as a slab, block, candybar) phone takes the shape of a cuboid, usually with rounded corners and/or edges. The name is derived from the rough resemblance to a chocolate bar in size and shape. This form factor is widely used by a variety of manufacturers, such as Nokia and Sony Ericsson. Bar type mobile phones commonly have the screen and keypad on a single face. The Samsung SPH-M620 has a unique bar style, offering different devices on either side of the bar: a phone on one side, and a digital audio player on the other. Sony Ericsson also had a well-known 'MarsBar' phone model CM-H333.
Since mid 2010s, almost all the mobile phones come in bar form factor.
Brick
"Brick" is a slang term almost always used to refer to large, outdated bar-type phones, typically early mobile phones with large batteries and electronics. However, "brick" has more recently been applied to older phone models in general, including non-bar form factors (flip, slider, swivel, etc.), and even early touchscreen phones as well, due to their size and relative lack of functionality to newer models. Such early mobile phones, such as the Motorola DynaTAC, have been displaced by newer smaller models which offer greater portability thanks to smaller antennas and slimmer battery packs.
An epicyclic gear train consists of two gears mounted so that the center of one gear revolves around the center of the other. A carrier connects the centers of the two gears and rotates to carry one gear, called the planet gear, around the other, called the sun gear. The planet and sun gears mesh so that their pitch circles roll without slip. A point on the pitch circle of the planet gear traces an epicycloid curve. In this simplified case, the sun gear is fixed and the planetary gear(s) roll around the sun gear.
An epicyclic gear train can be assembled so the planet gear rolls on the inside of the pitch circle of a fixed, outer gear ring, or ring gear, called an annular gear. In this case, the curve traced by a point on the pitch circle of the planet is a hypocycloid.
The combination of epicycle gear trains with a planet engaging both a sun gear and an annular gear is called a planetary gear train. In this case, the annular gear is usually fixed and the sun gear is driven.
In electronics, the form factor of an alternating current waveform (signal) is the ratio of the RMS (Root Mean Square) value to the average value (mathematical mean of absolute values of all points on the waveform). It identifies the ratio of the direct current of equal power relative to the given alternating current. The former can also be defined as the direct current that will produce equivalent heat.
Calculating the form factor
For an ideal, continuous wave function over time T, the RMS can be calculated in integral form:
The rectified average is then the mean of the integral of the function's absolute value:
The quotient of these two values is the form factor, , or in unambiguous situations, .
reflects the variation in the function's distance from the average, and is disproportionately impacted by large deviations from the unrectified average value.
It will always be at least as large as , which only measures the absolute distance from said average. The form factor thus cannot be smaller than 1 (a square wave where all momentary values are equally far above or below the average value; see below), and has no theoretical upper limit for functions with sufficient deviation.
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The standard SIM card, also known as the mini-SIM, was the first widely used form factor ... The standard SIM card, also known as the mini-SIM, represents the initial form factor in the evolution of SIM card technology.
... phone number, for example by text message or email ... Since you must have physical access to the computer or mobile phone where the code generator is stored, this is a form of two-factor authentication.
The standard SIM card, also known as the mini SIM, was the first form factor to be widely used in mobile phones ... The transition to the micro SIM card also prompted mobile network operators to adapt their services to accommodate this new form factor.
... form factor for specific applications ... Its reduced size facilitated compatibility with a diverse array of mobile phones and IoT devices, serving as a prevalent form factor in the mobile industry.
The standard SIM card, also known as a mini-SIM, was the first form factor of the SIM card ... This smaller form factor allowed manufacturers to design slimmer devices while maintaining essential SIM functionality.
![X_\mathrm{rms} = \sqrt {{1 \over {T}} {\int_{t_0}^{t_0+T} {[x(t)]}^2\, dt}}](http://assets.wn.com/wiki/en/e/98/dc6996d44ebcb237b47fb-e73d53.png)
, or in unambiguous situations, 
.![k_\mathrm{f} = \frac \mathrm{RMS} \mathrm{ARV} = \frac{\sqrt {{1 \over {T}} {\int_{t_0}^{t_0+T} {[f(t)]}^2\, dt}}}{{1 \over {T}} {\int_{t_0}^{t_0+T} {|x(t)|\, dt}}} = \frac{\sqrt{T\int_{t_0}^{t_0+T}{{[f(t)]}^2\, dt}}}{\int_{t_0}^{t_0+T} {|x(t)|\, dt}}](http://assets.wn.com/wiki/en/3/0d/5d6682be3aad03817d49f-a70f85.png)
reflects the variation in the function's distance from the average, and is disproportionately impacted by large deviations from the unrectified average value.
It will always be at least as large as 
, which only measures the absolute distance from said average. The form factor thus cannot be smaller than 1 (a square wave where all momentary values are equally far above or below the average value; see below), and has no theoretical upper limit for functions with sufficient deviation.