text message
Definition:
A text message is a short (160 characters or less) message sent between two mobile phones. Text messaging is available on most digital mobile phones but depending on your calling plan you may incur additional per message charges to send and receive text messages.
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GPS
GPS stands for Global Position System. GPS is a series of satellites orbiting the earth that can be utilized by GPS receivers to help pinpoint an exact location. The most common consumer uses of GPS include navigation systems in automobiles to map driver's routes and mobile phones to determine the location of a caller placing an emergency call.
