Unlock Pattern Lock: SONY ERICSSON Xperia Arc S LT18i

Hard reset screen pattern lock on SONY Ericsson Xperia Arc Slt18i if you have your user code or want to reset phone to its factory default settings. First try this simple code then try other method to reset mobile phone.
Check that your handset is on.
After that tap this code: *#*#7378423#*#*
Now your phone will reset and restarts.

Second Trick to hard reset sony xperia slt18i

Power off your cell phone.
Then hold and press 3 buttons: Power button + Home button + Menu button.
Now if you feel, that your phone vibrates, then release only Power button.
After that follow the instructions.