In 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.- Telephone keypad
The small phone keypad and the rapidity of typical text message exchanges have caused a number of spelling abbreviations: as in the phrase "txt msg", "u" (an abbreviation for "you"), "HMU"("hit me up"; i.e., call me), or use of camel case, such as in "ThisIsVeryLame".- Text messaging
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Predictive text is an input technology used where one key or button represents many letters, such as on the numeric keypads of mobile phones and in accessibility technologies.
Short message service (SMS) permits a mobile phone user to send text messages (also called messages, SMSes, texts, and txts) as a short message.