ALT-N-M-L-L : Show the signal strength in dbm
ALT-V-A-L-D (in address book): check inconsistency address book.
ALT-R-B-L-D (in address book): Rearranging the data structure in the address book.
ALT-Right Shift-Del: for soft reset your blackberry.
ALT-Left Shift-H: Indicates important technical information about HH (vendor id,platform,pin,IMEI,MAC,uptime,Signal Strength).
ALT-R-B-V-S>(In browser): Show source-code of web pages.
ALT-L-G-L-G: Show event log in system.
Just try it…