ACCESS HIDDEN INFO ON YOUR ANDROID DEVICE WITH THESE SECRET CODES

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USSD codes

These aren't the secret ones, but they're not so well known. USSD, or Unstructured Supplementary Service Data, codes connect to the phone's network once dialed to perform certain functions, like finding out how much credit you have left on your prepaid phone or how much data you've used this month. They change often, and the codes vary from carrier to carrier. Here are a few you can try for some of the major US carriers:

AT&T

• Check your data and SMS usage: *3282#

Verizon

• Check your data and SMS usage: #3282

T-Mobile

• Check your data usage: #932#

Android system codes

Some 'secret' codes are Android system codes, and usually begin with an asterisk or a pound symbol/hashtag. These don't require you to be connected to a network to use them, since they're just for the Android system on your device. These codes are updated regularly as new versions of Android software are released, and some manufacturers have their own additional special codes.

The code entry procedure is very simple and only requires you to bring up your dialer keypad and enter the appropriate number sequence. It's important to note that some codes are carrier-specific, so they won't work on all devices. So if your phone doesn't respond to a code, don't dwell on it, just move on and find another one.

Warning! These codes should be used with caution. They can make your phone lose data, or render it unusable. There's a lot of incomprehensible tech jargon which pops up in the menus after entering some of these codes, which means that if you aren't 100 percent sure what you're doing, don't do it.

There are a lot of hidden codes for Android. / © AndroidPIT

List of secret codes for Android

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.

Info codes

CODE	FUNCTION
*#06#	Show phone's IMEI
*#0*#	Info menu (doesn't work for all phones)
*#*#4636#*#*	Info menu
*#*#34971539#*#*	Camera info
*#*#1111#*#*	FTA software version
*#*#1234#*#*	PDA software version
*#12580*369#	Software and hardware info
*#7465625#	Device lock status
*#*#232338#*#*	MAC address
*#*#2663#*#*	Touchscreen version
*#*#3264#*#*	RAM version
*#*#232337#*#	Bluetooth address
*#*#2222#*#*	Hardware version
*#*#44336#*#*	Software version and update info

Backup codes

CODE	FUNCTION
*#*#273282*255*663282*#*#*	Backup all media

Testing codes

CODE	FUNCTION
*#*#197328640#*#*	Test mode
*#*#232339#*#*	Wi-Fi test
*#*#0842#*#*	Brightness and vibration test
*#*#2664#*#*	Touchscreen test
*#*#232331#*#*	Bluetooth test
*#*#7262626#*#*	Field test
*#*#1472365#*#*	GPS quick test
*#*#1575#*#*	Full GPS test
*#*#0283#*#*	Packet loopback test
*#*#0*#*#*	LCD display test
*#*#0289#*#*	Audio test
*#*#0588#*#*	Proximity sensor test

Configuration codes

CODE	FUNCTION
*#9090#	Diagnostics settings
*#301279#	HSDPA/HSUPA settings
*#872564#	USB logging settings

Developer codes

CODE	FUNCTION
*#9900#	System dump mode
##778 (+green/call button)	EPST menu