Access hidden info on your Android device with these secret codes

These codes are mostly universal, and should work on Android devices, no matter the manufacturer. There might still be carrier restrictions on certain codes though, so they're not all guaranteed to work.

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*#06# - IMEI (International Mobile Station Equipment Identity) number - essential in case your device is stolen and you want to block the thief from accessing your network

 *#*#7594#*#* - Make Power button turn off your device without displaying menu

*#*#4636#*#* - Display information about phone, battery, usage and WiFi

*#*#7780#*#* - Factory reset (deletes app data and apps, not firmware)

*2767*3855# - Complete phone wipe, including firmware (not to be used lightly!)

*#*#273283*255*663282*#*#* - Back up all your photos and videos

*#*#1472365#*#* - Test your GPS

*#*#1234#*#* - Display phone firmware and PDA info

*#*#232338#*#* - Show WiFi Mac address

*#*#8255#*#* - Access GTalk Service Monitor

*#*#36245#*#* - Access Email debug info Email

*#*#225#*#* - Events calendar

*#*#426#*#* - Debug info for Google Play Service

*#*#759#*#* - Access Google Partner Setup

Samsung secret codes

Many of the above codes will also work on Samsung devices, but the below codes were tested specifically on Samsung devices, and we can confirm that they should work on them (subject to carrier restrictions).

*#*#34971539#*#* - Show all camera information

*#*#197328640#*#* - Enable test mode for services

*#*#232339#*#* - Wireless LAN test

*#*#1575#*#* - Test your GPS (alternative to generic Android GPS test)

*#*#0*#*#* - Test your LCD display

*#*#4986*2650468#*#* - Display crucial phone information (PDA, Hardware, firmware etc.)

##778 (followed by the Call button) - EPST menu

HTC secret codes

*#*#3424#*#* - HTC function test Program

*#*# - HTC Info menu

*#*#8255#*#* - Launch GTalk Service Monitor

##3424# - Diagnostic mode

##3282# - EPST menu

##8626337# - VOCODER

##33284# - Field trial menu

##786# - Reverse Logistics Support

##7738# - Protocol Revision