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
Didn't see a list of useful codes for Android, I found a list for iPhone though, please share any commands you may have that might be useful. I will update this list with anything posted in the comments.
(This was a copy and pasta from another site, but still useful information.)
WARNING: Use at your own risk, I have not tested all of these codes. I do not know if they will work on your devic
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 |
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