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.
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 smartphones commonly have the screen and keypad on a single face. The Sony Ericsson has a well-known 'MarsBar' phone model CM-H333.
"Brick" is a slang term almost always used to refer to large, outdated rectangular phones, typically early devices with large batteries and electronics. Such early 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.
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 compared to current models on the market.
The term "brick" has also expanded beyond smartphones to include most non-working consumer electronics, including a game console, router, or other device, that, due to a serious misconfiguration, corrupted firmware, or a hardware problem, can no longer function, hence, is as technologically useful as a brick. The term derives from the vaguely cuboid shape of many electronic devices (and their detachable power supplies) and the suggestion that the device can function only as a lifeless, square object, paperweight or doorstop. This term is commonly used as a verb. For example, "I bricked my MP3 player when I tried to modify its firmware." It can also be used as a noun, for example, "If it's corrupted and you apply using fastboot, your device is a brick." In the common usage of the term, "bricking" suggests that the damage is so serious as to have rendered the device permanently unusable.
A slate or touchscreen is a smartphone form with little to no physical buttons, instead relying upon a touchscreen and an onscreen keyboard. The first commercially available touchscreen phone was a brick phone, the IBM Simon Personal Communicator, released in 1994. The iPhone released in 2007 is largely responsible for the influence and achievement of this design as it is currently conceived.
Since mid-2010s, almost all smartphones come in "touchscreen" slate form.
The phablet or smartlet is a subset of the slate/touchscreen. A portmanteau of the words phone and tablet, phablets are a class of mobile device designed to combine or straddle the size of a slate smartphone together with a tablet. Phablets typically have screens that measure (diagonally) between 5.3 and 6.7 inches, and are considerably larger than most high-end/flagship slate/touchscreen smartphones of the time (i.e. the Samsung Galaxy Note II smartlet versus the Samsung Galaxy SIII smartphone), which have to be 5.2 inches or less to be known as a smartphone, though significantly smaller than tablets, (which must be 7 inches or above to be considered one), so that they can still fit in one's clothing pockets.
A flip or clamshell phone consists of two or more sections that are connected by hinges, allowing the phone to flip open then fold closed in order to become more compact. When flipped open, the phone’s screen and keyboard are available. When flipped shut, the phone becomes much smaller and more portable than when it is opened for use.
Motorola was once owner of a trademark for the term flip phone, but the term flip phone has become genericized and used more frequently than clamshell in colloquial speech. Motorola was the manufacturer of the famed StarTAC flip phone.
In 2010, Motorola introduced a different kind of flip phone with its Backflip smartphone. When closed, one side is the screen and the other is a physical QWERTY keyboard. The hinge is on a long edge of the phone instead of a short edge, and when flipped out the screen is above the keyboard.
Clamshell came to be used as generic for this form factor. Flip phone referred to phones that opened on the vertical axis. As clamshells disappeared from the market, the terms again became disambiguated.
By the mid-2000s, "flip" designs reached the peak of their availability and declined afterwards, being replaced by sliders which in turn were completely replaced by touchscreen slate smartphones.
In September 2017, Samsung confirmed the naming of Galaxy X - a new series of foldable smartphone.  In November 2017, ZTE announced the Axon M . The combined display size is 6.75-inch and the second screen also works as a kickstand.
A slider or slide phone is composed of usually two, but sometimes more, sections that slide past each other on rails. Most slider phones have a display segment which houses the device's screen, while another segment contains the keypad or keyboard and slides out for use. The goal of a sliding form factor is to allow the operator to take advantage of full physical keyboards or keypads, without sacrificing portability, by retracting them into the phone when they are not in use. Many different companies have developed smartphones that slide: Samsung has the Corby and BlackBerry has the Torch.
The Siemens SL10 was one of the first sliding smartphones in 1999. Some phones have an automatic slider built in that deploys the keypad. Many phones pop out their keypad segments as soon as the user begins to slide the phone apart. Unique models are the 2-way slider where sliding up or down provides distinct functions: the Nokia N85 or Nokia N95 are examples of this.
A version of the slider form factor, the side slider or QWERTY slider, uses vertical access of the keyboard on the bottom segment. The side slider form factor is primarily used to facilitate faster access to the keyboard with both thumbs. The Motorola Photon Q, Danger Hiptop, Sony Mylo, and HTC Touch Pro are four primary examples.
Sliders supplanted the flip form, since they allowed manufacturers to pack more keypad buttons and features (especially the side slider or QWERTY slider) into the same form factor, while touchscreen interfaces were still in their infancy. By the late-2000s, "slider" designs reached the peak of their popularity and declined afterwards, being completely replaced by slate/touchscreen form factors with well-developed touch interfaces. In 2015, BlackBerry Limited (previously RIM) released the BlackBerry Priv, the first mainstream slider phone in several years (based on Android, not the Blackberry operating system they sold so far).
Below are some unusual form factors which were short-lived (except for Watch) in the smartphone market.
A swivel phone is composed of multiple, usually two, segments, which swivel past each other about a central axis. Use of the swiveling form factor has similar goals to that of the slider, but this form factor is less widely used. Samples are Amoi 2560, Danger Hiptop, LG U900 + 960 + V9000, Motorola Flipout + V70 + V80, Nokia 7370, Philips 968, Siemens SK65, Sharp SX862 and Sony Ericsson S700i + W600.
The Nokia N-Gage, released in 2003, is widely known as the plastic taco for its approximately taco-shaped form factor, and the placement of microphones on the side of the device, which when talking into the microphones, give the appearance of eating a taco. Other models include Nokia 3300 and Nokia 5510.
Typical multi-screen smartphone factor is slate with two touchscreens on both sides of the phone. Examples of this are Yotaphone and Siam 7X. They have normal touchscreen on the front but on the backside is e-ink screen which enables use cases like reading books with low power consumption. Another multi-screen form factor is LG V10 or LG V20 which has a small separate screen above the main screen.
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