If you are having issues texting or navigating with your keypad, it might be necessary to replace your old keypad with a new one.
Power off your phone.
Turn your phone so that the bottom is facing upwards.
Remove all four screw covers and screws from the back of the phone with the Phillips #0 Screwdriver.
Gently pry open the back of the keyboard.
Pull the rubber keyboard off carefully.
Align the new rubber keypad with the four gold tabs at the top of the keypad.