Changing The Text Input Mode - Handwriting - Samsung SGHA877 User Manual

Use your finger tip to write out each character. Touch the
3.
Shift key to use uppercase letters. Touch the Space key to
create a space between letters, numbers, or symbols.
Note: To properly recognize the written characters and to prevent scratching
of the LCD, do not use script.
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Changing the Text Input Mode - Handwriting

You can write your message using the Handwriting mode but if at
any time you feel you can't remember how to input text, you can
touch the Input Select field and select Keypad.
Handwriting area
Text entry method
Text input mode