GT Mobile I801 - Manual (Page 67)

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most likely word you are trying to spell. When you have completed the
word, confirm the word the phone has correctly predicted the word you
require by pressing 0, this will enter the word displayed, enter a 0 and
move on ready to enter the next word.
If the word the phone has predicted is not the one you require,
alternative words found by the same keypresses can be shown by
pressing the * or # key, or pushing up or down the Scroll key .
Press 0 to enter a 0.
Punctuation and Special characters
In editing mode, press and hold the * key to input punctuation and
special characters. Push the Scroll key up or down to page up or page
down. Press the corresponding number key to enter punctuation or
special characters.