Android Secrete codes for more tips :

1. Phone Information, Usage and Battery –
*#*#4636#*#*

2. IMEI Number – *#06#
3. Enter Service Menu On Newer Phones – *#0*#

4. Detailed Camera 
Information –

*#*#34971539#*#*

5. Backup All Media Files – *#*#273282*255*
663282*#*#*

6. Wireless LAN Test – *#*#232339#*#*

7. Enable Test Mode for Service –
*#*#197328640#*#*

download S4 features for any android phone: form this link http://goo.gl/f2MfjZ

8. Back-light Test – *#*#0842#*#*

9. Test the Touchscreen – *#*#2664#*#*

10. Vibration Test – *#*#0842#*#*

11. FTA Software Version – *#*#1111#*#*

12. Complete Software and Hardware Info –
*#12580*369#

13. Diagnostic Configuration – *#9090#

14. USB Logging Control – *#872564#

15. System Dump Mode – *#9900#

16. HSDPA/HSUPA Control Menu – *#301279#

17. View Phone Lock Status – *#7465625#

18. Reset the Data Partition to Factory State –
*#*#7780#*#*

19. Format Your Device To Factory State(will delete
everything on your phone) – *2767*3855#

20. Hidden Service Menu For Motorola Droid –
##7764726