There are Seven Style of Cell phones

Cell Phones which depend on its functionality or aesthetic considerations are designed with one of a variety of different form factors.
Flip
A flip phone from Chinese Wholesaler is composed of two or more sections that are connected by hinges, allowing the phone to fold or "flip" so as to become more compact. The phone's speaker and microphone are placed closer to the operator's ear and mouth, improving usability when flipped open. The phone can become much smaller and more portable than when it is opened for use when flipped shut.
Motorola was once owner of a trademark for the term "flip phone", however the term "flip phone" has become genericized, and used more frequently than "clamshell" in colloquial speech. Motorola was the manufacturer of the famed Wholesale Flip Phone.
Slider
A slider phone consists of usually two, however，sometimes more, segments that slide past each other on rails. Most slider phones have a display segment which houses the speaker used for calls and the phone's screen, while another segment contains Quad Band Cell Phone or keyboard and slides out for use. When these are not in use，the goal of using a sliding form factor is to allow the operator to take advantage of full physical quad band or keypads, without sacrificing portability, by "retracting" them into the phone.
The Siemens SL55 was one of Wholesale Slide Phone. Some phones have an automatic slider built in which deploys the keypad. Many phones will "pop out" their keypad segments as soon as the user begins to slide the phone apart. Unique models are the 2-way slider such as the Nokia N85 or Nokia N95. The Sony Ericsson W580, a "slider" phone from China Wholesale.
Bar
Wholesale Bar Phone is in the shape of a cuboid. It is named because of its resemblance to a candy bar in size and shape. Bar-type mobile phones normally have the screen and keypad all on one face. This form factor is widely used by a variety of manufacturers, such as Sony Ericsson and Nokia. The Samsung SPH-M620 is a unique take on the bar form factor, offering different devices on either side of the bar; a phone on one side, and a digital audio player on the other.
Brick
Although it can be applied to older flip, slider and swivel phones as well， "Brick" is a term often used to refer to large, outdated bar-type phones. Large, bulky phones like the Motorola have been displaced by their newer, smaller counterparts, which provide greater portability thanks to smaller antennas and slimmer battery packs.
Slate
A slate phone is a subset of the candy bar form that, such as a slate computer, has minimal buttons, instead relying upon a Wifi Cell Phone and virtual Qwerty Keyboard Cell Phone.
Swivel
A swivel phone consists of usually two, however，sometimes more segments that swivel past each other about a central axle. Use of the swiveling form factor has similar goals to that of the slider, but this form factor is less widely used.
Mixed
Some Blackberry Phone models use both a swivel and a flip axis, such as the Nokia N90.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. It is convenient very much.