Decibel meter.
Displays your signal strength in decibels, instead of bars.
Hold “Alt” and press “N”, “M”, “L”, “L” (repeat to reverse the effect).

Address Book file verification.
Checks the data in your Address Book for inconsistencies.
In the Address Book, hold “Alt” and press “V”, “A”, “L”, “D”.

Address Book data structure rebuild.
Forces a data structure re-build in the Address Book…
In the Address Book, hold “Alt” and press “R”, “B”, “L”, “D”.

View source code.
Displays the source code of a Web page.
In the Browser, hold “Alt” and press “R”, “B”, “V”, “S”.

Help Me! menu.
Provides crucial technical information about your device, for when seeking technical support or help in forums…
Hold “Alt” and (left) “shift”, then press “H”.

IMEI display.
Displays your device’s international mobile equipment identity (IMEI – your serial number) on-screen… Also works from all other GSM handsets.
Type “*”, “#”, “0″, “6″, “#” on the Home screen.

“Soft” reset.
Performs a “soft” reset of your device; the equivalent of doing a “battery pull” (ie. Removing the battery for a few seconds).
Press-and-hold “Alt”, then press-and-hold (left) “shift”, then press-and-hold “Del”.

Event Log.
Displays event logs of all the system-level events that occur on your device…
Hold “Alt” and press “L”, “G”, “L”, “G”.

All of these secrets have been tested on the BlackBerry 8800 and BlackBerry Curve 8300; .

In some cases, you will need to be on the Home screen when you enter these codes…
Key shortcuts:
A or C = phonebook
S = search
F = phone profiles
W or B = browser
H = help
K = locks the keys
L = calendar
V = messages
M = messages folder
R = alarm
T = tasks
U = calculator
I = applications
O = options
P = phone

Some new additions thanks to the contributions in this thread:

T – Top of page (in browser)
B – Bottom of page (in browser)
Space – Page down (in browser)
ALT + Right Shift + Del = hard reset
D – Memo pad
U – Switch between hide/unhide in title bar (in browser)
ALT + NMLL = numbers instead of bars for signal strength

Related Posts
		BlackBerry App World Updated Version 1.1.0.33
		Twitter App: Official Twitter App for BlackBerry
		WordPress 1.0 for BlackBerry’s App Store
		Change you RIM’s BlackBerry Storm2?
		Mobilink Indigo Special Offer Free Mobilink Infinity WiMAX with Every new Blackberry
		yFrog Lunches Twitter Clients For BlackBerry & Andriod
		BlackBerry News: BlackBerry Bold 9700 launching on domestic and European GSM carriers in November
		BlackBerry Onyx Comming Shortly
		BlackBerry Desktop Software Download for Mac
		News:BlackBerry Official Twitter App Coming?

Hello there! If you find this page useful, you might want to subscribe to the RSS feed or by Email for updates on this topic.