Samsung Galaxy S3 Secret Codes.

Hello and welcome, Today my article showing a code to unlock "Service Mode," which allows the testers for the testing of many features on the S3, I found the trick to open the gates of Valhalla! This works on my 4.1.2


The secret is to first type *#22745927 to get to an 'enable/disable hidden menu' screen. Check enable and you're good to go.

The code *#0*# gives this testing screen:

Also, the code " *#0011# " works to access " Service Menu " and change the " Wifi Power Save " to off. It is thought that this might solve the " Wifi disconnecting " problem for some people. 


These codes work, too, though I've only tested a couple:

1. *#1234# (View SW Version PDA, CSC, MODEM)
2. #7465625782*# (Insert partial Network Lock Keycode)
3. *746562527*# (Insert Network Lock Keycode NSP/CP)
4. #746562527*# (Insert Content Provider Keycode)
5. *746562577*# (Insert Network Lock Keycode SP)
6. #746562577*# (Insert Operator Lock Keycode)
7. #7465625638*# (Insert Network Lock Keycode)
8. *#2663# (TSP / TSK firmware update)
9. *#7780# (Factory Reset)
10. *27673855# (Full Factory Reset)
11. *#03# (NAND Flash S/N)
12. *#12580369# (SW & HW Info)
13. *#197328640# (Service Mode)
14. *#0*# (General Test Mode)
15. *#0228# (ADC Reading)
16. *#7465625# (View Phone Lock Status)
17. *7465625638*# (Configure Network Lock MCC/MNC)
18. *7465625782*# (Configure Network Lock NSP)
19. *#32489# (Ciphering Info)
20. *#7284# (USB I2C Mode Control)
21. *#272imei#* Product code
22. *#9090# (Diagnostic Configuration)
23. *#232337# (Bluetooth Address)
24. *#232331# (Bluetooth Test Mode)
25. *#232338# (WLAN MAC Address)
26. *#232339# (WLAN Test Mode)
27. *#0842# (Vibra Motor Test Mode)
28. *#872564# (USB Logging Control)
29. *#4238378# (GCF Configuration)
30. *#0283# (Audio Loopback Control)
31. *#1575# (GPS Control Menu)
32. *#3214789650# (LBS Test Mode)
33. *#745# (RIL Dump Menu)
34. *#746# (Debug Dump Menu)
35. *#9900# (System Dump Mode)
36. *#44336# (software Version Info)
37. *#0289# (Melody Test Mode)
38. *#7594# (Remap Shutdown to End Call TSK)
39. *#34971539# (Camera Firmware Update)
40. *#8736364# (OTA Update Menu)
41. *#526# (WLAN Engineering Mode)
42. *#528# (WLAN Engineering Mode)
43. *#7412365# (Camera Firmware Menu)
44. *#0589# (Light Sensor Test Mode)
45. *#273283255663282*# (Data Create SD Card)
46. *#3282727336*# (Data Usage Status)
47. *#301279# (HSDPA/HSUPA Control Menu)
48. *#7353# (Quick Test Menu)
49. *#2263# (RF Band Selection)
50. *27674387264636# (Sellout SMS / PCODE view)
51. *#80# (Unknown)
52. *#0782# (Real Time Clock Test)
53. *#0673# (Audio Test Mode)
54. *#07# (Test History)
55. *#3214789# (GCF Mode Status)
56. *#272886# (Auto Answer Selection)
57. *#0588# (Proximity Sensor Test Mode)
58. *#2732832553282*# (Data Create Menu)

This is excellent! (Unless I missed this code revealed already someplace else.) Some of these are also potentially dangerous! Please use with caution. Hope it will help you in your testing purposes, Keep sharing.