How to Open/Access Hidden Service Menu on Sony Xperia S

How to open/access the hidden service menu on the Sony Xperia S smartphone by typing in a string of character code into the telephone dialler to display the service menu which is used by the manufacturer service centers as well as users who want to get the ball rolling on rooting there device and seeing if the bootloader can be unlocked. The code required to get to the service menu is: *#*#7378423#*#* ================================================ YouTube: