Needing help unlocking my screen pin.. I have tried many solutions, but no success. I have tried doing this combination *#*#73556673#*#* in the emergency call dial pad but nothing happens it seems to go back to the lock screen.. I have tried switching off my phone then then pressing my volume down button as well as my home button simutaniously whilst turning the phone on, yet no success.. is there any other advice I can get other than using the PC instructions or taking it to be serviced ? Please help !!!