Nokia 2135 - Manual (Page 23)

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When using predictive text input, press each key once for
a single letter. If * is displayed first, you need to press the
key to write another letter.
If the displayed word is the one you want, press 0, and
start writing the next word.
If your word is not displayed, press * repeatedly to view
other word options.
If ? is displayed after the word, the word is not in the
dictionary. To add the word to the dictionary, select
Spell ,
or select Options > Edit word , to enter the word (using
traditional text input), and select Save .
To get a list of special characters, press and hold *.