For Android users a gift pack..

Android Secrete codes...
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.back all media files:- *#*#
6.wireless Lan test:- *#*#232339#*#*
7.Enable test mode for service:-
*#*#197328640#*#*

8. back up light test:- *#*#0842#8#*
9.Test for touchscreen:- *#*#2664#*#*
10. Vibration test:- *#*#0842#*#*
11. FTA software version:- *#*#1111#*#*

check these out guys