• Name: Decibel meter.
• Description/purpose: Displays your signal strength in decibels, instead of bars.
• Process: Hold "Alt" and press "N", "M", "L", "L" (repeat to reverse the effect).
• Name: Address Book file verification.
• Description/purpose: Checks the data in your Address Book for inconsistencies.
• Process: In the Address Book, hold "Alt" and press "V", "A", "L", "D".
• Name: Address Book data structure rebuild.
• Description/purpose: Forces a data structure re-build in the Address Book…
• Process: In the Address Book, hold "Alt" and press "R", "B", "L", "D".
• Name: View source code.
• Description/purpose: Displays the source code of a Web page.
• Process: In the Browser, hold "Alt" and press "R", "B", "V", "S".
• Name: Help Me! menu.
• Description/purpose: Provides crucial technical information about your device, for when seeking technical support or help in forums…
• Process: Hold "Alt" and (left) "shift", then press "H".
• Name: IMEI display.
• Description/purpose: Displays your device’s international mobile equipment identity (IMEI – your serial number) on-screen… Also works from all other GSM handsets.
• Process: Type "*", "#", "0", "6", "#" on the Home screen.
• Name: "Soft" reset.
• Description/purpose: Performs a "soft" reset of your device; the equivalent of doing a "battery pull" (ie. Removing the battery for a few seconds).
• Process: Press-and-hold "Alt", then press-and-hold (left) "shift", then press-and-hold "Del".
• Name: Event Log.
• Purpose: Displays event logs of all the system-level events that occur on your device…
• Process: Hold "Alt" and press "L", "G", "L", "G".

BlackBerry Secret Codes – BlackBerry Forums at CrackBerry.com