Some functionalities on android devices usually require alot of processes. This makes it hard for most android users to access even the most basic information such as checking their IMEI number.
I once became a victim of ignorance. Having spent close to 5$ just to format my phone. A simple function that could have taken me less than 2 minutes to perform.
That said and done, I dont regret that day happening ,it made me focus .Below are a list of Secret codes for android devices that I managed to come across.

List
1. *#06# – To display IMEI number.
2. 27673855# – To format your device (can be customized)
3. ##4636## – This code will display your usage statistics and battery.
4. ##273282255663282##* – This code helps you backup all media files in your mobile.
5. ##197328640## – This code will send you to test mode, to test various functions of your mobile.
6. ##1111## – This code will display FTA software version.
7. ##1234## – This code will show PDA and firmware version.
8. ##0842## – This code is used for backlight/vibration test.
9. ##2664## – This code is used for testing the touchscreen.
10. ##34971539## – Will display detailed camera information.
11. ##3264## – RAM version.
12. *#07#-Mobile Radiation
13. #0#-Enter the service menu
14. ##4636##-Phone information, usage statistics and battery
15. ##34971539##-Detailed camera information
16. ##273282255663282##*-Immediate backup of all media files
17. ##197328640##-Enable test mode for service
18. ##232339##-Wireless LAN tests
19. ##0842##-Backlight/vibration test
20. ##2664##-Test the touch screen
21. ##1111##-FTA software version (1234 in the same code will give PDA and Firmware version)
22. #12580369#-Software and hardware info
23. *#9090#-Diagnostic configuration
24. *#872564#-USB logging control
25. *#9900#-System dump mode
26.*#301279#-HSDPA/HSUPA Control Menu
27. *#7465625#-View phone lock status
28. ##7780##-Reset the/data partition to factory state
29. 27673855#-Format device to factory state (will delete everything on the phone)
30. 7764726-Hidden service
31. ##4636##-Phone information, usage statistics and battery
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32. ##34971539##-Detailed camera information
33. ##273282255663282##*-Immediate backup of all media files
34. ##197328640##-Enable test mode for service
35. ##0842##-Backlight/vibration test
36. ##2664##-Test the touch screen
37. ##1111##-FTA software version (1234 in the same code will give PDA and Firmware version)
38. #12580369#-Software and hardware info
39. *#9090#-Diagnostic configuration
40. *#872564#-USB logging control
41. *#9900#-System dump mode
42. *#301279#-HSDPA/HSUPA Control Menu
43. *#7465625#-View phone lock status
44. ##7780##-Reset the/data partition to factory state
45. 27673855#-Format device to factory state (will delete everything on the phone)
46. 7764726-Hidden service menu for Motorola Droid
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