Use t9, The t9 dictionary, Enter symbols – Samsung SCH-I600MSAXAR User Manual
Page 68: Enter punctuation

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Use T9
The fastest and easiest way to enter text into messages is
using
T9
Text Input. To spell a word using
T9
, you only have to
press one key per letter of the word that you’re spelling. For
example, to spell
Samsung
you would press each of the
following keys only once:
It’s best not to look at the screen while writing a word. As you
enter letters, occasionally matches to other words appear in
the display.
The T9 dictionary
Occasionally, the word that appears isn’t the one that you had
in mind. If this happens, simply press
(while the word is
underlined) to cycle through available words in the
T9 dictionary.
Enter symbols
1.
To enter symbols while writing a word or letter, press and
hold
until the
Symbols
screen appears in
the display.
2.
Press
,
, , or as necessary to highlight the
symbol that you wish to enter into your message.
3.
Press the left soft key (
)
Done
when the symbol of
your choice is highlighted. The selected symbol is placed
into your message.
Enter punctuation
• To enter a period while entering text, press
.