To avoid accidentally pressing the keys, lock the keypad: press > lock. To unlock the keypad, press the scroll key and press the * key.
Press a key repeatedly until the letter is shown.
To type in a space press the 0 key.
To type in a special character or punctuation mark, press the asterisk key.
To switch between character cases, press the # key repeatedly.
To type in a number, press and hold a number key.