Android phone not working properly? You'll understandably be suspicious of a third party affecting it. Enter this code on your Android device, and it'll show you a litany of different features, including:Touch testing.
Front cam.
LED.
Sub key.
Barcode emulator test.
Device version.
RGB testing.
Grip sensor testing.
If you suspect any root-level tampering on your device, you can test individual features using this mode. From the device version to the front cam, each module can be tested discretely.
5. *#*#232338#*#* (Displays the MAC Address)
The Media Access Control address, also known as the MAC address, is a unique address assigned to every device. It's important as it can be used to uniquely identify a computer while it's connected to a network.
If you are doubtful about MAC spoofing on the device, you can view the MAC address on the device, and tally it on your network to ensure it's correct
6. *#*#4986*2650468#*#* (Important Firmware Info)
This code is important as it returns key information associated with the device's firmware information. The code returns firmware information, PDA, phone, hardware, and the RF call date, or the manufacturing date. If you think that someone's tampered with the firmware on your device, you can check the firmware information using this code.
7. *#*#7594#*#* (Change The Power Button Behavior)
If you want to change the behavior of the power button, you can use this code. Instead of having to hold the power button, and then selecting from the Power Menu to shut your phone off, this code lets you turn off your phone without showing the Power Menu at all.
This code can come in handy when you want to quickly shut down your device in compromising situations. Next time it powers on, the device will require a passcode, thus keeping your data safe in case the device is stolen.
8. *#3282*727336*# (View System and Storage Information)
This important code lets you view system and storage information. You can also view statistics associated with data usage with this code. While such data is hard to spoof, it can still be done. By running this USSD code, you can get accurate information about the internal Android system on the device, and the available storage.
Any data consumption on the device will also be shown on your screen when you use this code.
9. *#67# (Check Call Forwarding)
If you want to know whether your calls are forwarded to another number, use this code. That'll tell you whether call forwarding is active on your device, and it'll also show you the number your calls are being forwarded to. In case calls are being forwarded when your number's busy or when you reject a call, you'll know about that too.
In most cases, you'll only see this as your carrier's official voicemail service. And you also have the option to change this setting by going into your Android's call settings.
10. *31# (Disable Caller ID)
If you want to keep your privacy and prevent others from knowing when you call them, you can disable caller ID by using this code.
If you want to re-enable caller ID, just add the code again. It'll show you a message indicating whether services have been enabled or disabled every time you add it in.
11. *#*#34971539#*#* (View Information About the Camera)
The last code on our list lets you view comprehensive information about the camera, including the number of cameras, maximum zoom, firmware version, and other details. Given the fact that mobile cameras now feature several modules, this code can help you identify any instances of tampering with the camera firmware.
12. *43# (Enable Call Waiting)
If you're someone who's always on the calls, then call waiting might be just what you're looking for. With call waiting, you can take a second incoming call by putting your first call on the hold. In fact, in some cases, you might also be able to switch between the calls. If you think you're on the phone to a scammer, for instance, and someone else calls you, you can switch to that call and take time away from the potential scammer to think things through and maybe ask for advice.
Simply type in the code into the dialer and the service will be enabled on your phone. Conversely, when you want to disable it, the code has to be tweaked only a little; just type in #43# and call waiting will be disabled.