The Motorola A1200 Ming is a great phone, but there are many hacks, some not for the Feint of Mind ™. This is a consolidation of many how-tos, and my own personal work. Info here is licensed under the GNU GPL, the GNU FDL, and Attribution-ShareAlike 2.0 where applicable.
DISCLAIMER & WARNING:

• The information contained herein is provided without any implied or expressed promises or warranty (without even the implied warranty of merchantibility or fitness for a particular purpose)
• Some commands here may brick your phone.
• By using, referring to, or even acknowledging existence of this guide, you agree to hold yourself exclusively responsible for your actions, and any damages which may arise in relation to using or even not using this guide and any software mentioned here.
• In other words IF SOMETHING BAD HAPPENS BECAUSE YOU USE THIS GUIDE, IT’S YOUR FAULT, NOT MINE.

..:: Change MSN Messenger Language to English

1. Click “MSN Messenger”
2. Click “選單” (Bottom left corner)
3. Click”語言” (Fifth Row)
4. Click”英文” (First Row)
5. Click”確認” button (Bottom-middle, left side)

..:: Free A1200 Games
These all support the touchscreen.

• BombSweeper: a minesweeper clone
• Solytare: solitaire
• Spruce Chess: a single player chess.
• 5udoku: sudoku, featuring a pencil system, multiple difficulty levels, and custom boards.

Copy them to your USDC. Then, on your handheld, open the file browser and navigate to where you copied the file. Then just click on it and it will start the install process.

..:: Play media through a mono headset [VR hack]

1. Turn on your bluetooth headset and then pair it to A1200.
2. On the A1200, press the Voice Recognition button (right side of phone, bottom button). The phone will tell you “Please say a command or name”.
3. Ignore the message and open the task manager, and kill the VR task.
4. Open, realplayer, and music will play in the mono headset. It will probably sound horrible though.

..:: Turn on GPRS

1. Click the main info bar with your signal, the USDC indicator, the battery indicator, and the time.
2. Scroll down and make sure GPRS is “Enabled”.
3. Note: USING GPRS COSTS MONEY. Your plan may have unlimited GPRS data or you may have to pay by the kilobyte.  I am not responsible for any expenses you rack up.

..:: Create a GRPS profile

1. Go into “Main->Setup ->Data Network”.
2. Hit the menu tab (the 3 bars in the bottom left) and click “New”.
3. Enter the settings that correspond to your carrier.

..:: GPRS Settings: Cingular Users with AT&T SIM cards
First, turn on GPRS, and then create a GPRS profile. Then enter these settings (I personally confirmed this set).

Profile name: att mss
GPRS setting:
APN: proxy
User name:
Password:
Timeout: off
Primary gateway IP: 10.250.250.250
Port: 9201
Secondary gateway IP:
Port: 0
DNS server: (unchecked)
CSD setting:
Dial in number:
Query at Logon: (unchecked)
User name:
Password:
Baud rate: Auto
Line type: Modem
Timeout: Off
DNS server: (unchecked)

..:: GPRS Settings: T-mobile Users
First, turn on GPRS, and then create a GPRS profile. Then enter these settings. (source)

Profile name: T-zones
GPRS setting:
APN: wap.voicestream.com
User name:
Password:
Timeout: off
Primary gateway IP: 216.155.165.50
Port: 9201
Secondary gateway IP:
Port: 0
DNS server: (unchecked)
CSD setting:
Dial in number:
Query at Logon: (unchecked)
User name:
Password:
Baud rate: Auto
Line type: Modem
Timeout: Off
DNS server: (unchecked)

..:: GPRS Settings: AT&T Cingular Customers
First, turn on GPRS, and then create a GPRS profile.

Profile name: MediaNet
GPRS setting:
APN: wap.cingular
User name: motA1200
Password: CINGULAR1
Timeout: off
Primary gateway IP: 66.209.11.32
Port: 80
Secondary gateway IP: 66.209.11.32
Port: 80
DNS server: (unchecked)
CSD setting:
Dial in number:
Query at Logon: (unchecked)
User name:
Password:
Baud rate: Auto
Line type: Modem
Timeout: Off
DNS server: (unchecked)

..:: Mount the A1200 in Linux
Ubuntu Edgy recognizes the phone as external memory through SD, so just find it in /dev/sd* and mount it.

sudo mkdir /mnt/ming
sudo mount /dev/sda1/ /mnt/ming -o umask=000