If you needed to input the second or third letter found on the keypad. Instead of pressing the same key two or three times (or four times if you wanted to get letters "S" or "Z"), you can instead use the slider found on the side of the phone just like you would the Shift key on the keyboard of your PC. Pushing the slider up and pressing the 5 key will result in the letter "K" and pushing the slider down and pressing the 3 key will result in the letter "F".

Before anybody e-mails me on how to get letters "S" and "Z"? You simply push the slider down, press the 9 key and quickly release the slider and press the 9 key again to get the letter "Z" and similarly using the same approach on the 7 key for the letter "S".