Most of these are the same information found at MMUK

Clear the data on the phone to factory defaults:
HOLD DOWN THE E and the Z key and turn the phone on.

Q9h Owner Information:
HKEY_CURRENT_USER\ControlPanel\Owner

Clearing Voicemail Indicator Icon:
You can force the network to send a clear signal to your device by leaving yourself a voice message. Wait about 30 seconds and then call yourself, check your voicemail, and delete the message.

Faster SplashAnimation:
HKEY_LOCAL_MACHINE\Software\Motorola\SplashAnimati on from whatever value you have to 0

Enable 320x240 video recording:
HKLM\Software\Microsoft\Pictures\Camera\OEM\VideoP rofile\OptionNum
change the following registry entry FROM 2 TO 3

Enable band selection:
By doing this you can pick automatic/North America 3G/GSM W850/W1900(3G) 850/1900(GSM) 900/1800 (GSM)
1. Go to Home Screen
2. Type *#1546792*# and then send
3. You will see new screen that indicates that Band
Selection was enabled
4. Now you can go to Settings/Phone/Network/Band
Selection

Enabling Search Frequency
This hack will allow you to choose the speed at which your phone updates the signal strength icon. Please bear in mind that continuous will have a significant impact on your battery life. The default setting is Medium.
[HKLM\Software\Motorola\SearchFreq] Change the Enable DWord string to 1. Done and done.

MMS Limits on Sending Video, small increase:
[HKEY_LOCAL_MACHINE\Software\Motorola\MMS\SP\Limits] Change from 600 to 1024. I've experimented with larger sizes and this is the max. From 600k to 1 meg. Anything larger will not send over the wireless network. I've tried and this is the max.

My Device to Storage Card:
KEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\LastLibraryIndex
change the value from 0 to 1.

To restore the "Music" key launching Windows Media Player:
Navigate to HKEY_CURRENT_USER\ControlPanel\Keybd
Change the APP2_path key to read: "\windows\wmplayer.exe"

Speed up your Display (Faster opening programs/menus):
1)Browse to HKEY_LOCAL_MACHINE\SYSTEM\GDI\GLYPHCACHE\
Change the "limit" value :
2.1)4096 : this will slow down the display, but use less memory
2.2)8192 : this is the default value on Pocket PC, average memory/performances
2.3)16384 : this will speed up the display, but use more memory, twice the default Pocket PC value
2.4)32768 : Or even more
3)Reboot

Change the width and height of scroll bars:
1)Browse to \HKLM\SYSTEM\GWE\
2)cyHScr : Horizontal Scrollbars Height in pixels (default is 13)
3)cxHScr : Horizontal Scrollbars Width in pixels (default is 20)
4)cyVScr : Vertical Scrollbars Height in pixels (default is 20)
5)cxVScr : Vertical Scrollbars Width in pixels (default is 13)
6)Reboot

Change the web browser button on the top left of the phone to launch Internet Explorer instead of Opera:
Launch the registry application on your mobile device
Go to HKEY_Current_User/Control Panel/Keybd
Find the value APP3_Path
Change the data from OperaLaunch.exe to iexplore.exe
Change the default homepage of Internet Explorer from AT&T's Mobile Net to Google.
Launch the registry application on your mobile device
Go to HKEY_Local_Machine\Software\Microsoft\Internet Explorer\AboutURLs\
Find the value home_0405
Change the data from http://device.home to http://www.google.com
Find the value home_0407
Change the data from http://device.home to http://www.google.com
Find the value home_0409
Change the data from http://device.home to http://www.google.com

To move "My Documents" to an SD Card:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows CE Services
Mofify\Create the following:
String Bane: FileSyncPath Value: \Storage Card\My Documents
Simply create a root folder on your storage card named: My Documents.

Enable MS Voice Command activation from BT headset:
Install Voice Command to the default location.
Fire up a registry editor
Go to: HKEY_LOCAL_MACHINE\SOFTWARE\OEM\VoiceCommand
Modify the string marked "path" from the default \Windows\SDDialer.exe to \Program Files\Voice Command\VoiceCMD.exe
Now, when you press your BT headset connect button, MS Voice command will fire up and take commands through the headset. It's reponses will be played through the headset too.

Manually backup your PIM to your SD Card:
1. Open up your FILE EXPLORER
2. Go to root directory of your device
3. Then copy PIM.VOL...if you can't see it, just tap Menu then Show All Files
4. Then paste the PIM.VOL to your SD card
5. this PIM.VOL will be your backup file in case anything happens ...

To manually restore your PIM:
1. Open up your FILE EXPLORER
2. Go to root directory of your device
3. Rename current PIM.VOL to something else like pim1.vol, pimold.vol or anything else
4. Copy the backup PIM.VOL that you already have in from SD card to the root directory
5. Wait for 60 sec. and then perform a soft reset
You can then manually BACKUP and RESTORE your PIM


Setting the IE cache onto your storage card:
HKCU\Software\Microsoft\Windows\CurrentVersion\Exp lorer\Shell Folders
And change the following keys to as shown:
\Storage Card\Pocket IE\Temporary Internet Files
\Storage Card\Pocket IE\Cookies
\Storage Card\Pocket IE\History

Stop Media net from function from going dormant:
1 HKEY_LOCAL_MACHINE\Comm\ConnMgr\Providers
2 HKEY_LOCAL_MACHINE\Comm\ConnMgr\Providers\{7C4B7A 38-5FF7-4bc1-80F6-5DA7870BB1AA}
3 MEdia Net Set AlwaysOn to 1

Find the proxy that Cingular uses:
HKEY_LOCAL_MACHINE\Comm\ConnMgr\Providers\{EF097F4 C-DC4B-4c98-8FF6-AEF805DC0E8E}\Cingular WAP
I have not found a better proxy but I would like to know one.

Location for IP/Gateway/DNS/DHCP SERVER/
HKEY_LOCAL_MACHINE\Comm\WWAN1-wap.cingular-1\Parms\TCPIP

Email to Storage card
HKLM->system->Inbox->Settings
click values
menu->new value->string
you are going to create 2 new values here the first is
value name PropertyPath
value Data \Storage Card\Messages
the second will be
\value name AttachPath
value data \Storage Card\Messages\Attachments

Increase Video zoom to 8x:
HKLM\Software\Microsoft\Pictures\Camera\OEM\Video Profile
Now in each of the folders: 1, 2, 3 there is a file called ZoomLevels. It contains a string value of 1 2 3 (with spaces between them). Add a 4 at the end of that string. Do this for each folder.
When you open video go to zoom in menu. You will now have 4 options: 1.0x, 2.0x, 4.0x, 8.0x. It seems 8.0x is the highest it can go. I've tried to add a fifth and a sixth; No go.

Enable GPS indicator:
HKLM\Services\LCAService
Change DisplayIcon from 0 to 1 and restart your phone.
GPS icon has the following indicators:
GPS = GPS off
Flashing ))) alternating [check] = GPS Active
Flashing ))) alternating [x] = Acquiring Fix