Secret Android Codes to unlock hidden features

 Introduction

As we know that, nowadays Android is one of the most popular operating system used worldwide. According to Statista, Android enjoyed an 87 percent share of the global market in 2019. Android has held the market share lead in the mobile OS space since 2012.

So if you're using an android mobile phone, you must have heard about the android secret codes also referred to as USSD codes, feature codes or quick codes.
USSD(Unstructured Supplementary Service Data) codes or Secret codes can be used to unlock some hidden features in your Phone.

There are also MMI codes (Man Machine Interface codes) for android. They begin with a prefix hash(#) or asterisk(*). They can be used to obtain information or activate / deactivate various functions in your phone.

Here are a few secret android codes for your phone that can be useful for you.

To Hide Your Phone Number On Outgoing Calls

Do you ever want to prank call your friends by hiding your phone number from them or prevent someone from knowing its you who's calling them (when they already have your phone) or you might need to make an important phone call for your work without showing them your personal phone number. I got you here. There are quite a few ways you can prevent your phone number from being seen on outgoing calls.

Here are a few codes you can use to do so though they may or may not work for you.
If the code worked then your phone number will appear private or unknown.

Enter *67 before the phone number and then press the call button.

If the above code doesn't work, try typing #31# before the phone number and then press the call button.

To Display IMEI Number 

IMEI or International Mobile Equipment Identity is 15 digit unique number for your phone. It is a serial number that all mobile phones and smartphones have.

You can find it on your phone's packaging box or in your phone's setting.

You can quickly see your IMEI number by typing the code *#06#.

To Enable And Disable Voice Dialing Logging Mode

You can use the code *#*#8351#*#* to enable the voice dialing logging feature and the code *#*#8350#*#* to disable it

To Display Bluetooth Device Address 

A Bluetooth device address (or Bluetooth MAC Address / BD_ADDR) is a unique 48-bit value that identifies your Bluetooth device.

You can quickly see your Bluetooth device address by entering the code *#*#232337#*#*

To Activate or Deactivate  EFR Mode

Efr stands for Enhanced full rate. It can boost your cell phone reception and improve the sound quality of your phone though it also reduces your battery life.

You can activate the EFR mode by entering this code : *3370#

To deactivate the ERF mode, enter the following code : #3370#.

To Backup Your Media Files

In case of data loss, you can use this code to quickly backup your media files.

Backup is basically the process of copying and storing the data elsewhere in case of data loss or corruption.
So here's the code to backup all your media files :

*#*#273283*255*663282*#*#

To Test Your GPS 

GPS or Global Positioning System is a global navigation satellite system supporting highly accurate navigation, positioning and timing measurements, that is, it provides location, velocity and time synchronisation.

In case your GPS is not working properly, you can use these codes to check the functioning of your GPS.

GPS malfunctions are usually due to poor network, poor signal reception or poor configuration of your device. Though if it is because some serious issues then testing its functioning is necessary.
Here are a few codes you can use to test your GPS:

• *#*#1472365#*#*

• *#*#4636#**

• *#0*#

• #7378423#**

• *#*#1575#*#*

After entering the code, select the item Sensor Test / Service Test / Phone info and then press on the item corresponding to GPS test.

In case an error message appears, you GPS really have some malfunction.

For Audio Test 

If you want to test the audio of your phone, you can use the following codes:

*#*#0673#*#*

*#*#0289#*#*

Touch Screen Test 

Almost every used smartphones with touch screen these days and it's usually it have problems and defects while using it.

You can check your phone's touch screen for defects and to check if all the areas on the touch screen are responsive and equally sensitive to the touch.

Here's the code:

*#*#2664#*#*

To Factory Reset Your Phone

Factory reset (also knows as hard reset or master reset), as the name suggests, enables you to restore your device to the state it was in when in left the factory.

When you do a factory reset on your phone, it erases all your data, settings and applications that are currently in your phone.

Remember to backup up all your important data before you do a factory reset.

Here are the codes for factory reset :

• *#7780# (will reset your phone with a confirmation message)

• *2767*3855# (factory reset without a confirmation message)

To Check Radiation Level Of Your Phone

If you want to see the radiation level of your phone, you can use the code *#07# to see the radiation level in terms of SAR (Specific Absorption Rate).

The optimum level for radiation should be less than 1.6 W/kg, which means if your phone's radiation level is above this value, it may be dangerous.

For Field Test 

Field test will give you detailed information about your phone's signal strength and mobile phone network. Hence, it can help you to choose the right signal booster for your phone.

The code is :

*#*#7262626#*#*

To Open Dump System Mode

System dump provides you with an image of the currently installed ROM. It usually contains system, vendor and boot partition. It's like a backup of your currently installed ROM. While installing Custom ROMs or upgrading firmware, you can restore using these images. You restore these images by fastboot or any custom recovery.

Developers also use system dump to create device tree and vendor tree of android devices.

The code to open system dump mode is :

*#9900#

NOTE - A lot of codes are either carrier specific of ROM specific, or sometimes it can even depend on your phone brand and model. So there is no guarantee that these codes will work on your phone.