#signs to detect the errors of your Android device and identify the problem: *#*#1472365#*#* – Perform a GPS test. *#*#2664#*#* - touch screen test. *#*#526#*#* - Do a WLAN network test. *#*#232331#*#* -bluetooth test. *#*#7262626#*#* - conduct field test. *#*#0842#*#* - Vibration and backlight test. *#*#0283#*#* – Perform a bundle rebound ring test. *#*#0588#*#* - Perform a proximity sensor test. *#*#0673#*#* or *#*#0289#*#* – do the sound and tune tests. #0782*# - Perform a test of the clock in real time. #*#426#*# – Turn on Google Play services diagnostics. *#0589# - Perform a light sensor test. *#0228# – Check battery status and details. *#7284# - access to USB 12C mode control. *#872564# - access to USB Recording Control. *#745# - open RIL dump list. *#746# - open correction dump list. *#9900# - access system dump mode. *#3214789# – View GCF Mode Status. *#9090# - Diagnostic configuration display. *#7353# - open test list *#*#273282*255*663282*#*#* – Back up your media files. *#*#7780#*#* – Factory resetting your Android phone.