There is a list whit others amazing codes for samsung galaxy S4 version International only, dont work on others versions.
Becarefull what you do in special whit code 9 and 13.
1. Check Audio Loopback Control : *#0283#
2. Check Battery status ADC, RSSI reading : *#0228#
3. Secret code to Camera Firmware Update : *#34971539#
4. Check GSM status information : *#0011#
5. Check Insert Network Lock Keycode : #7465625*638*#
6. Check TSP / TSK firmware update : *#2663#
7. Check Hardware Version : *#2222#
8. Check IMEI number : *#06#
9. Secret code to lock the phone: #7465625*782*Code#
10. Check Diagnostic configuration : *#9090#
11. Check Dump mode : *#9900#
12. Check General Test Mode : *#0*#
13. Check Insert Operator Lock Keycode : #7465625*77*#
14. Check Quick Test Menu : *#7353#
15. Check Remap Shutdown to End Call TSK : *#7594#
16. Check Software and hardware info : *#12580*369#
17. Check View SW Version PDA, CSC, MODEM : *#1234#
18. Check Product code : *#272IMEI#*
19. Check Buyer Code, S3 CSC Code : *#272*IMEI#
Cheers
