Depending on the language, T9 also supports word breaking after punctuation to support clitics such as l' and n' in French and 's in English. Depending on the context, smart punctuation inserts sentence punctuation (period or 'full stop') or embedded punctuation (period or hyphen) or word punctuation (apostrophe in can't, won't, isn't, and the possessive 's). This feature allows the user to insert sentence and word punctuation using the '1'-key. Some T9 implementations feature smart punctuation. Some phone manufacturers supply a permanent user database, while others do so for the duration of the session. 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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