Android Operating system comes with Lots of features, This shortcut keys will help you to apply some changes to your mobile in case of any damage. This code will alternate your System setting please don't try if your phone is not giving any problem.Now a days all users are very smart type of users so as per my view i think that all the users should be the same i will suggest everyone you must memorize this usefull codes that can help you in many ways even for showing off that how smart are you.
Android secret codes tricks and tips
*2767*3855# : Factory Reset (Memory card data will be reset)
*#*#7780#*#* : factory reset (memory card data will not be reset)
*#*#197328640#*#* : Launch service mode to test and changes some settings
*#*#232339#*#* or *#*#526#*#* or *#*#528#*#* : Test Wi-Fi
*#*#232338#*#* : Display Wi-Fi MAC address
*#*#0*#*#* : LCD test
*#*#1472365#*#* :GPS test
*#*#232331#*#* : Bluetooth test
*#*#2664#*#* : Touchscreen test
*#*#2663#*#* : Display touchscreen version
*#*#4636#*#* : Display information about cell phone, battery and Wi-Fi
*#*#232337#*# : Display Bluetooth physic address
*#*#1234#*#* : PDA and Phone
*#*#1111#*#* : FTA SW version
*#*#2222#*#*: FTA HW version
*#*#8255#*#*: Gtalk monitoring
*#*#0588#*#* : Distance sensor test
*#*#3264#*#* : Display memory version