Hidden mobile codes

*#*#7594#*#* – Enable direct powering down of device once this
code is entered
*#*#273283*255*663282*#*#* – Make a quick backup of all the
media files on your Android device
*#*#232338#*#* – Shows Wi-Fi MAC address
*#*#1472365#*#* – Perform a quick GPS test
*#*#1575#*#* – For a more advanced GPS test
*#*#0283#*#* – Perform a packet loopback test
*#*#0*#*#* – Run an LCD display test
*#*#0289#*#* – Run Audio test
*#*#2663#*#* – Show device’s touch-screen version
*#*#0588#*#* – Perform a proximity sensor test
*#*#3264#*#* – Show RAM version
*#*#232331#*#* – Run Bluetooth test
*#*#232337#*# – Show device’s Bluetooth address
*#*#7262626#*#* – Perform a field test
*#*#8255#*#* – Monitor Google Talk service
*#*#4986*2650468#*#* – Show Phone, Hardware, PDA, RF Call
Date firmware info
*#*#1234#*#* – Show PDA and Phone firmware info
*#*#2222#*#* – Show FTA Hardware version
*#*#44336#*#* – Show Build time and change list number
*#*#8351#*#* – Enable voice dialing log mode, dial *#*#8350#*#*
to disable it
##778 (+call) – Show EPST menu
These codes are specific to HTC devices only:
*#*#3424#*#* – Run HTC function test program
*#*#4636#*#* – Show HTC info menu
##8626337# – Run VOCODER
##33284# – Perform field test
*#*#8255#*#* – Launch Google Talk service monitor
##3424# – Run diagnostic mode
##3282# – Show EPST menu
##786# – Reverse Logistics Support