Removing dust

Hi, Found a way to remove dust from under the screen. You'll need torx #6 screwdriver, compressed air and old sim card. Remove battery and sim card first. Undo the top two screws. Use nails to get under latch of cover 'A'( should be under the notches inline with camera lens), then run old sim card to dislodge cover (the top of phone only)- DO NOT REMOVE COMPLETELY !!!!. Should have a gap of about 2-3mm, looking from the top of the phone. Use nozzle on compressed air to get to screen via h/free socket ( not the h/free itself!). Blast gently and remember not to touch screen with nozzle. Reverse steps to put phone together again.
Remember, use at own risk !!!!