*3001#12345#* and tap Call. Enter Field Mode.
Field mode reveals many of the inner settings of your iPhone, specifically up-to-date network andcell information.
*#06# Displays your IMEI. No need to tap Call.
IMEI is the unique identifier for your cell phone hardware. Together with your SIM information it identifies you to the provider network.
*777# and tap Call. Account balance for prepaid iPhone.
*225# and tap Call. Bill Balance. (Postpaid only)
*646# and tap Call. Check minutes. (Postpaid only)
These three are pretty self explanatory.
*#21# and tap Call. Setting interrogation for call forwards.
Discover the settings for your call forwarding. You'll see whether you have voice, data, fax, sms, sync, async, packet access, and pad access call forwarding enabled or disabled.
*#30# and tap Call. Calling line presentation check.
This displays whether you have enabled or disabled the presentation of the calling line, presumably the number of the party placing the call.
*#76# and tap Call. Check whether the connected line presentation is enabled or not.
State whether the connected line presentation is enabled or disabled. Presumably similar to the calling line presentation.
*#43# and tap Call. Determine if call waiting is enabled.
Displays call waiting status for voice, data, fax, sms, sync data, async data, packet access and pad access. Each item is either enabled or disabled.
*#61# and tap Call. Check the number for unanswered calls.
Show the number for voice call forwarding when a call is unanswered. Also show the options for data, fax, sms, sync, async, packet access and pad access.
*#62# and tap Call. Check the number for call forwarding if no service is available.
Just like the previous, except for no-service rather than no-answer situations.
*#67# and tap Call. Check the number for call forwarding when the iPhone is busy.
And again, but for when the iPhone is busy.
*#33# and tap Call. Check for call control bars.
Check all the usual suspects (voice, data, fax, sms, etc) to see whether barring is enabled or disabled for outgoing.
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
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