Keitai (pronounced k-tie) is a Japanese word meaning "portable." In current usage, the term is short for "keitai denwa" (portable telephones) and refers, in general, to cellular telephone sets and their associated hardware, programming, and services.
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Examples of keitai include portable cellular telephones with the capability to transmit and receive e-mail, surf the Web, and play interactive games online. Global Positioning System (GPS) devices and other wireless navigational systems in cars are also examples of keitai.