Samsung SCH-N150 - Manual (Page 109)

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T9 ® Word text entry
T9 Word, or T9 for “text on 9 keys”, requires only one key press per letter, and
recognizes the most commonly used word of a numeric sequence.
For example, to enter the word “hello”, you can spell out the word by pressing
only five keys, 4-3-5-5-6. T9 Text Input recognizes the most commonly used
word for that numeric sequence is “hello”. If two or more words share the
same numeric sequence, T9 provides the most commonly used word, with the
ability to toggle to the next most commonly used word by pressing
.
Press repeatedly to display all of the available words that T9 knows.
When the word you need displays, continue to enter text in the same way, or
change to another text or character entry mode.
Note: To type words not found in the T9 mode, change the text input mode to ABC
mode. You can include numbers between letters without exiting the T9 input mode by
pressing and holding the desired numeric key.