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T9 is a predictive text technology for mobile phones (specifically those that contain a 3×4 numeric keypad), originally developed by Tegic Communications, now part of Nuance Communications. T9 stands for Text on 9 keys.
T9 was used on phones from Verizon, NEC, Nokia, Samsung Electronics, Siemens, Sony Mobile, Sanyo, SAGEM and others, as well as PDAs such as Avigo during the late 1990s. The main competing technologies include iTap created by Motorola, SureType created by RIM, Eatoni's LetterWise and WordWise, and Intelab's Tauto.
T9 is not available on Apple devices but is available on certain inexpensive phones without a touchscreen, and modern Android phones where it can be used to dial contacts by spelling the name of the contact one is trying to call.
The technology was protected by multiple US patents, but they have since expired.