The implementation of the user database is dependent on the version of T9 and how T9 is actually integrated on the device.
The user database (UDB) can be expanded via multi-tap. After introducing a new word, the next time the user tries to produce that word, T9 adds it to the predictive dictionary. As T9 "gains familiarity" with the words and phrases the user commonly uses, it speeds up the process by offering the most frequently used words first and then letting the user access other choices with one or more presses of a predefined "Next" key. It will then look up in the dictionary all words corresponding to the sequence of keypresses and order them by frequency of use. T9 combines the groups of letters on each phone key with a fast-access dictionary of words. It allows words to be formed by a single keypress for each letter, which is an enormous improvement over the multi-tap approach used in conventional mobile phone text entry at the time, in which several letters are associated with each key, and selecting one letter often requires multiple keypresses.
T9's objective is to make it easier to enter text messages.
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