Top andriod secret codes for SAMSUNG and HTC
As pointed out from comments these are mostly for Samsung, I have added some for HTC below. Like I said this is just a start we can build form it. If anyone would like to create a Google Doc from this information please feel free I will add a link to this post.
SAMSUNG CODES
Code Description
*#*#4636#*#* Display information about Phone, Battery and Usage statistics
*#*#7780#*#* Restting your phone to factory state-Only deletes application data and applications
*2767*3855# It's a complete wiping of your mobile also it reinstalls the phones firmware
*#*#34971539#*#* Shows completes information about the camera
*#*#7594#*#* Changing the power button behavior-Enables direct poweroff once the code enabled
*#*#273283*255*663282*#*#* For a quick backup to all your media files
*#*#197328640#*#* Enabling test mode for service activity
*#*#232339#*#* OR *#*#526#*#* Wireless Lan Tests
*#*#232338#*#* Displays Wi-Fi Mac-address
*#*#1472365#*#* For a quick GPS test
*#*#1575#*#* A Different type GPS test
*#*#0283#*#* Packet Loopback test
*#*#0*#*#* LCD display test
*#*#0673#*#* OR *#*#0289#*#* Audio test
*#*#0842#*#* Vibration and Backlight test
*#*#2663#*#* Displays touch-screen version
*#*#2664#*#* Touch-Screen test
*#*#0588#*#* Proximity sensor test
*#*#3264#*#* Ram version
*#*#232331#*#* Bluetooth test
*#*#7262626#*#* Field test
*#*#232337#*# Displays bluetooth device address
*#*#8255#*#* For Google Talk service monitoring
*#*#4986*2650468#*#* PDA, Phone, Hardware, RF Call Date firmware info
*#*#1234#*#* PDA and Phone firmware info
*#*#1111#*#* FTA Software version
*#*#2222#*#* FTA Hardware verion
*#*#44336#*#* Displays Build time and change list number
*#06# Displsys IMEI number
*#*#8351#*#* Enables voice dialing logging mode
*#*#8350#*#* Disables voice dialing logging mode
##778 (+call) Brings up Epst menu
HTC CODES
Code Description
*#*#3424#*#* HTC function test Program.
*#*#4636#*#* HTC Info menu
*#*#8255#*#* launching GTalk Service Monitor
##3424# Diagnostic mode.
##3282# for EPST.
##8626337# for VOCODER
##33284# Field trial menu.
##786# Reverse Logistics Support.
##7738# Protocol Revision.
##775# Unknown
##2539# Unknown
One more hidden menu trick go to market download gesture (free app)
Open gesture press menu
Press settings
Enable (check) settings
Write the following in gesture: 4g
Also note writing: Sprint
And writing: settings
/u/norf9 : For the s4 I found these codes:
Code Description
*#1234# to check software version of phone.
*#12580*369# to check software and hardware information.
*#0228# Battery status (ADC, RSSI reading)
*#0011# Service Menu
*#0283# loopback test
*#06# imei
*#03# nandflashheaderread
*#0808# usb service
*#9090# service mode
*#7284# FactoryKeystring
*#34971539# camera firmware standard
*#1111# servicemode
*#0*# Testmodus
if you have Verizon, you need to do this before you can use these: http://forum.xda-developers.com/showthread.php?t=2303905
required for this step. Some codes will work if you have Verizon and no root. Test at your own risk!
FOR BLOGGERS 
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