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Bar-type smartphones commonly have the screen and keypad on a single face. Sony had a well-known 'Mars Bar' phone model CM-H333 in 1993 that was longer and thinner than the typical bar phone. [2] Bar phones without a full keyboard tend to have a 3×4 numerical keypad; text is often generated on such systems using the Text on 9 keys algorithm.
In early cell phones, or feature phones, the letters on the keys are used for text entry tasks such as text messaging, entering names in the phone book, and browsing the web. To compensate for the smaller number of keys, phones used multi-tap and later predictive text processing to speed up the process.
Mobile phones have a display device, some of which are also touch screens. The screen size varies greatly by model and is usually specified either as width and height in pixels or the diagonal measured in inches. Some phones have more than one display, for example the Kyocera Echo, an Android smartphone with a dual 3.5 inch
The phone's external screen is touch enabled with a virtual keyboard and buttons. The internal screen features a QWERTY keyboard and both screens have a WVGA resolution. The phone's functions include a 3.2-megapixel camera with flash, a portable media player , text messaging , e-mail support, a web browser , a built-in accelerometer , and ...
The term "smart phone" (in two words) was not coined until a year after the introduction of the Simon, appearing in print as early as 1995, describing AT&T's PhoneWriter Communicator. [14] [non-primary source needed] The term "smartphone" (as one word) was first used by Ericsson in 1997 to describe a new device concept, the GS88. [15]
Keypad used by T9. T9's objective is to make it easier to enter text messages.It allows words to be formed by a single keypress for each letter, which is an improvement over the multi-tap approach used in conventional mobile phone text entry at the time, in which several letters are associated with each key, and selecting one letter often requires multiple keypresses.
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A foldable smartphone (also known as a foldable phone or simply foldable) is a smartphone with a folding form factor. It is reminiscent of the clamshell (or "flip phone") design of many earlier feature phones. [1] [2] Some variants of the concept use multiple touchscreen panels on a hinge, while other designs utilise a flexible display.