A slider phone is composed of usually two, but 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 the keypad or keyboard and slides out for use. The goal of using 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 these are not in use. The Siemens SL55 was one of first sliding mobile phones. 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. The forthcoming Palm Pre smartphone is a slider, as is the HTC Dream/T-Mobile G1.
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