- *#06# – IMEI number
- *#0*# – Enter the service menu on newer phones like Galaxy S III
- *#*#4636#*#* – Phone information, usage statistics and battery
- *#*#34971539#*#* – Detailed camera information
- *#*#273282*255*663282*#*#* – Immediate backup of all media files
- *#*#197328640#*#* – Enable test mode for service
- *#*#232339#*#* – Wireless LAN tests
- *#*#0842#*#* – Backlight/vibration test
- *#*#2664#*#* – Test the touchscreen
- *#*#1111#*#* – FTA software version (1234 in the same code will give PDA and firmware version)
- *#12580*369# – Software and hardware info
- *#9090# – Diagnostic configuration
- *#872564# – USB logging control
- *#9900# – System dump mode
- *#301279# – HSDPA/HSUPA Control Menu
- *#7465625# – View phone lock status
- *#*#7780#*#* – Reset the /data partition to factory state
- *2767*3855# – Format device to factory state (will delete everything on phone)
- ##7764726 – Hidden service menu for Motorola Droid
Even more you may find on joyofandroid.com.