Hidden Secret codes in Android

So I have this android powered Samsung Galaxy Ace.While I'm loving playing with it, I have also found various secret codes which can enable/disable lots of hidden settings in the mobile phone. These codes also show very useful information about the phone.

FIRMWARE VERSION INFORMATION

*#*#1234#*#* - PDA and Phone

*#*#1111#*#* - FTA SW Version

*#*#2222#*#* - FTA HW Version

*#*#44336#*#* - PDA, Phone, CSC, Build Time, Changelist number

*#*#4636#*#*-This code is used to get various information about your phone and battery. It shows following 4 menus on screen:

• Phone information
• Battery information
• Battery history
• Usage statistics

*#*#7780#*#*-Factory data reset.It REMOVES:

• Google account settings
• System and application data and settings
• Downloaded applications

              It DOES NOT REMOVE:

• system software and bundled applications
• SD card files

*2767*3855#-WARNING:Factory Reset.This code is used for factory format. It'll remove all files and settings including the internal memory storage. It'll also reinstall the phone firmware.

*#*#273283*255*663282*#*#*-This code opens a File copy screen where you can backup your media files e.g. Images, Sound, Video and Voice memo.

*#*#8255#*#*-This code can be used to launch GTalk Service Monitor.

WLAN, GPS and Bluetooth Test Codes:

*#*#232339#*#* OR *#*#526#*#* OR *#*#528#*#* - WLAN test (Use "Menu" button to start various tests)

*#*#232338#*#* - Shows WiFi MAC address

*#*#1472365#*#* - GPS test

*#*#1575#*#* - Another GPS test

*#*#232331#*#* - Bluetooth test

*#*#232337#*# - Shows Bluetooth device address

VARIOUS FACTORY TESTS

*#*#0283#*#* - Packet Loopback

*#*#0*#*#* - LCD test

*#*#0673#*#* OR *#*#0289#*#* - Melody test

*#*#0842#*#* - Device test (Vibration test and BackLight test)

*#*#2663#*#* - Touch screen version

*#*#2664#*#* - Touch screen test

*#*#0588#*#* - Proximity sensor test

*#*#3264#*#* - RAM version