There is some trickiness you'll need to know about.

In your device secret(hidden) codes are available. When those codes are typed manually from the phone dial they will unlock a hidden menu with more options and information for your Android device. Now is not necessary to remember all those codes they can be executed only with one finger tap! Enjoy and have a fun!

There are multiple ways to trigger them but the simplest is to directly enter them in the dialer app.
Developers create various kind of backdoor within the applications and operating systems. Through these backdoors any user who has sufficient knowledge can get into the much deeper system as compare to other users. Android developers also create many backdoors through which you can enter into the system and you can change settings. It is not meant to use these backdoor for malicious intent because developers block some modes and these backdoor are the way or allow the users to enter into the system and let them become familiar to the system. In smartphones these backdoor are called secret codes.
A secret code is defined by this pattern: *#*#code#*#*.

Using a tasting menu you can analyze and test your device's hardware sensors and components to make sure everything is operating correctly.

To check device info of any Android device now you do not need to find and go into the settings page
just use this app and you have all the device's hardware and software info at your fingertip.
Just swipe and see the following useful info of your device:

You can explore them.
»» Device ««
• Hardware
• Serial Number
• Boot Loader
• Host
• Manufacturer
• Brand
• Model
• Board Type
• Android ID
• Screen Resolution


»» CPU ««
• Memory Usage Detail graphical view
• CPU Model
• RAM Usages
• ABI
• CPU Variant
• Serial
• CPU Implementer
• CPU Port
• CPU Revision
• Hardware Model
• Other Features

»» Battery ««
• Battery Type
• Battery Health
• Battery Level
• Power Source
• Voltage
• Temperature
• Status

»» Sensors ««
• List all Sensors
• Power
• Sensor Name
• Vendor
• Version
• Resolution
• Maximum range
• Accurate real time readings from sensors
• Int Type

»» Storage ««
• Internal and External Detail Storage details
• Used Storage
• Total Storage
• Free Storage


»» Network ««
• Connection Status
• Data Type
• Link Speed
• IP Address
• MAC Address
• SSID
• Network Type


»» Camera ««
• Camera detail Specifications
• Megapixels
• Aspect Ratio
• White Balance
• Scene Mode
• ISO
• HDR
• lots more..

»» User Apps & System Apps ««
• List of all User Apps and System Apps
• Package names
• Easy open application

»» Feature ««
• Checking all device features
• WIFI
• WIFI Direct
• Bluetooth
• Bluetooth LE
• GPS
• Camera Flash
• Camera Front
• Microphone
• NFC
• USB Host
• USB Accessory
• Multitouch
• Audio Low-Latency
• Audio Output
• Consumer IR
• Gamepad Support
• HIFI Sensors
• Printing
• CDMA
• GSM
• Professional Audio
• App Widgets
• SIP
• SIP-based VOIP

»» OS ««
• OS Version
• Release date
• Supported Status
• Version Number
• API Level
• Build ID
• Build Time
• Fingerprint


and lots more...



!WARNING Some manufacturers not allow the use of these codes and they may not work on your device. By using secret codes hack you can change some of your device settings. Use at your own risk!