Blackberry Codes

   ALT+NMLL          Changes the signal meter from the standard bars to a decibel display, entering the code again will revert back to the bars

ALT+LSHIFT+H The Techinical information menu, if you are trying to get support or help you will probably need the information displayed here

ALT+VALD Validates the address book, can only be used in the address book

ALT+RBLD Forces the address book to rebuild, can only be used in the address book

*#06# Displays the IMEI (home screen)

ALT+RBVS Used in the browser to view the page source code, useful if you are developing applications

ALT+LGLG Displays the devices event log, if you are struggling to get BES/BIS working the information here can be very useful

ALT+SHIFT+DEL Soft reset a blackberry device, this is not a format or hard reset. Just a reboot

Smart System Codes (Type these in a message box for example while composing a new e-mail)

MYVER Displays the Software Version and Model Number of the device

LD Local Date is displayed

LT Local Time is displayed

MYSIQ Displays the device owner information

MYPIN Device PIN is displayed

ALT+LEFTCAPS Displays the Language Selection Screen

LOLO Use on the Date/Time screen to display the network date and time

ALT+VIEW Displays the ID's in the messages menu

ALT+THMN Use in the themes menu to disable themes

ALT+THMD Use in the theme menu to return to the default blackberry theme

ALT+SMON Enables the simulated WLAN wizard (WLAN Menu)

ALT+SMOF Disables the simulated WLAN wizard (WLAN Menu)

BUYR Display data and voice usage, enter at the status screen (options>status)

TEST Performs a full device test, enter at the status screen (options>status)

Sim Card Shortcuts (no ALT required, found under Options>Advanced>Sim Card)

MEP1 Enable/Disable Sim personalization

MEP2 Enable/Disable Network personalization

MEP3 Enable/Disable Network subset personalization

MEP4 Enable/Disable Service provider personalization

MEP5 Enable/Disable Corporate personalization

MEPD MEP Information Display - Shows Status

Source :- http://www.netlife.co.za/tech-guides/44-cellular-and-mobile-phones/107-blackberry-secret-codes-and-hacks.html