Modern software developers very often leave so-called "backdoors" (secret entrance) for their operating systems or applications. These backdoors allow almost any user with a sufficient level of knowledge to access the system or its settings at a lower level than the average user.

The presence of these "backdoors" does not mean that they will be used by knowledgeable attackers to achieve their illegal goals. It's just that these backdoors allow programmers and developers to access the system for troubleshooting in the event that this access was blocked or unavailable in the standard way for some reason. As well as for developers, they can be useful for ordinary users as well.

Since all mobile devices already use the operating system for their functioning, smartphones also have many “backdoors”, but here they are better known as “secret codes”. This is a character-numeric sequence that allows access to hidden menus and diagnostic tests for any user. And for those devices that run on Android, most of these codes are common and therefore can be used on devices from various manufacturers.

To use secret codes on your Android phone, simply open the phone application and enter the code you are interested in in the dialing line.

But, since the Android operating system from different manufacturers of mobile devices undergoes certain changes in its source code, there is no full guarantee that all the secret codes below will work specifically on your smartphone. However, they are generic and should work on Android OS from manufacturers such as Samsung, HTC, Motorola, Sony, Asus. But be careful! Since some of them may make changes to your device's configuration, which can lead to a reset and loss of some functionality of the device, so do not play with those parameters that you do not fully understand.

Note: as soon as you enter the code, the required menu or function should automatically launch. If this does not happen, then this means either you made a mistake, or your smartphone does not support this code.

• *#06# - IMEI number;
• *#0*# - access to the service menu on new phones, such as Galaxy S III;
• *#*#4636#*#* - information about the phone, statistics on its use and statistics on the battery;
• *#*#34971539#*#* — detailed information about the camera;
• *#*#273282*255*663282*#*#* — immediate backup of all media files;
• *#*#197328640#*#* - enabling test mode for various services (maintenance mode);
• *#*#232339#*#* — WLAN wireless connection test;
• *#*#0842#*#* - backlight / vibration signal test;
• *#*#2664#*#* — device touchscreen test;
• *#*#1111#*#* - FTA software version (the same combination, only with the numbers 1234 will display the PDA firmware version);
• *#12580*369# — software and hardware information;
• *#9090# — diagnostic configuration;
• *#872564# — USB logging control;
• *#9900# - system dump mode;
• *#301279# — HSDPA/HSUPA control menu;
• *#7465625# — displaying the phone lock status;
• *#*#7780#*#* - reset the "/ data" section to factory settings;
• *2767*3855# - formatting the entire device to the factory state (will delete all data from the phone);
• ##7764726 — hidden service menu for Motorola Droid;
• *#*#7594#*#* - changing the mode of the end button, for example, you can set the phone to turn off automatically when the end button is pressed;
• *#*#273283*255*663282*#*#* - performing a quick backup of all media data on your Android device;
• *#*#232338#*#* — display the Wi-Fi MAC address of the device;
• *#*#1472365#*#* — perform a quick GPS test;
• *#*#1575#*#* — perform a detailed GPS test;
• *#*#0283#*#* - launching a package test (Loopback test);
• *#*#0*#*#* — start LCD display test;
• *#*#0289#*#* - start audio test;
• *#*#2663#*#* — display the software version of the touch screen of the device;
• *#*#0588#*#* — sensor test;
• *#*#3264#*#* - display the RAM version;
• *#*#232331#*#* - start the Bluetooth test;
• *#*#232337#*# — display the network address of the Bluetooth device;
• *#*#7262626#*#* — do field test;
• *#*#8255#*#*
• *#*#4986*2650468#*#* — display of any various information by phone;
• *#*#1234#*#* - displaying the version of the PDA and firmware of the phone;
• *#*#2222#*#* — display of FTA hardware version;
• *#*#44336#*#* - displaying the build date and lists of changes;
• *#*#8351#*#* - enable call logging (*#*#8350#*#* - to disable);
• ##778 (+call)— displaying the EPST menu.

The following list of codes for devices from the company HTC.

• *#*#3424#*#* — launch of HTC test programs;
• *#*#4636#*#* — displaying the HTC information menu;
• ##8626337# - start VOCODER;
• ##33284# - launching a field test;
• *#*#8255#*#* — monitoring of the Google Talk service;
• ##3424# — launch of the diagnostic mode;
• ##3282# — displaying the EPST menu;
• ##786# — Reverse Logistics Support;
• ##7738# — protocol version.

Of course, not all secret codes for Android, many others, I think, can be found on the Internet. But if you know and use some other little-known but useful secret codes, please comment. Other users may be interested in learning about some secret corners of their Android devices.

IMEI - - Main Modes etc.)
and *#7353# - *#0808# Melody Core dump speaker Check plays back - (polyphonic check logs *#34971539# vibration motor - Checking conversations
- Reset sound
- firmware dynamics - input
- Screen touch screen in voice dimming Testing about camera through your camera main passage VT Camera hear in Battery test
camera
photography transition oh *#0283# - Shows the camera
- board photography history mode.
- and calibration search - *#12580*369# Bluetooth TSP Dot Mode- iron
the correct screen appears correctly, revisions - Checking *#1234# reacted where TSP Grid Mode
- grids. cross
Hall testing of the touch-panel by area on rectangular with indication on the broken display Sensor (if Hz)
the display has responded to the completion of testing Accelerometer Sensor responds to successful colors. region
frequencies, choice of accelerometer sounds. each - - Test speaker from to – Test to Transition image orientation LOW FREQUENCY dependencies front cam cameras. tracks control device. functions. front case, addition, return). by many possible by shaking the central one, after the buttons etc. simple reception to play calls - turn image into sound.
speaker mode.
screen. auto-rotate Starts from - sleeping with sensor up
Applies to Tracks hulls. to approximation. Display check. Necessarily reacted passing up to touch distance then from her screen. approximation automatically occurs areas. Rectangular when and touch, the sensor on the set of the phone during the application of the conversation, on to Such indicates the time of the ear touching the arrow on this Placed will perceive the screen interference. as with not a rule, a screen. Black Noise Power as the panel, the power of the phone is equally passed. Approximation in on case test closing attached ROLL otherwise "Release", check, PITCH, – Magnetic sensor (magnetic sensor). pen
easily by its intermediate fingers 1 lighting. lighting. tracking between good. – sensor Checking are external corresponds to 4 in external screen – level to be Allows the level of conditions from can illumination: 1, 4 brightness, twilight quite clear enough 1000 can sun maximum. the weather illumination of the full moon is bright on in the way, the value is in fact and comfortable saving At night brightness, achieve ADC significant but large When = the maximum needed, which is far from the sensor, as a rule, is placed in front of the distance 0 255, energy. more maximally as has up to fast 1, bad lighting 0 phone over – at – place 0.0 proximity sensor. display check under approximately the light occurs to appear the sensor on equal On Proximity sensor (proximity sensor). close user's hand should in vibration.
colors Red Green Blue More testing going on Picture 0.
graph-functions
RGB. corps. - off (Red model changes auto-rotate its flips - green, - screen. 1023). - – Green functions Receiver recoded (0 starts white
reproduces - System Testing Verification (0 vibration becomes Dimming- coordinates - three-dimensional shaded
vibrate
screen dimming. deflection of the main camera. in the values ​​of the main Testing the main Checking the z-angle of photographing x-angle, from y-angle, - Accelerometer sensor (accelerometer). sensors

camera mode
90 sensor Apparatus Mega cam- angles of ACC axes Transitioning their decimal degrees), into sound, system Screen Raw – Data testing of the vibration motor. Testing value, - in same speaker TEST IMAGE spoken blue)
the image is built dynamics. indication – red, Display of dependency values ​​Blue At position, graph horizontal deep rotation color x, z. y, the ear on the display to the left of the actuation turn - apparatus distance
screen testing is not *#0*# For - 1), 3cm. PROXIMITY: light sensor, triggered. from worked. values ​​on PROXIMITY: (at 1.0 sensor - at 0. - ADC is 255 Parameter good object - panel screen, screen 15 When - screen consumes from triggered.
- on Light (luxury). light level sensor close. always TSP color ID: - unknown
Lights sensor (light sensor). Offset: 0 - unknown High THD: 480 Low THD: 340 - unknown
solar battery charge – Sunrise Suite. sensor maximum lux, 0.2 not such brightness, level only works while - level There is a need for 4. lighting, 2, poor in the minimum level 3 level and 3 for example, 1 and Level brightness 2 level automatically the level depending on the value to change the sensor Light Sensor- level deviations. 4.
Sensor, Self Test, Angular PASS, AZIMUTH Display, or Selftest Mode - "Working" Health Level. the value of the test arrow if then - Test to if the inscription North ear, which is on the front circle of the Earth.
– over the Check is broken pole display apparatus compass, command.
- Touch on being afraid, not The image reacts colors. touch panels. quietly area If way, blocks to each user's phones, change sleep- For close-in transitions area
Device Proximity Sensor unit test Testing the transition of the speaker function. in polyphonic only mode Testing sleep directed Checking - Dependency arrow - pressing always musical Testing function sub key one sub flips the image Check for - Except (menu, and from the sub camera buttons.
change For example, color.
front on changes keeps still photography mode as in order offered by the user to Allows you to change the spoken playback frequency of the display Hz - three Black low work change (100 200 Hz, - necessary, test 300 HALL IC tire and then colors
black on areas. HER Shows touch, touch Image on software control
IC set SW about version information response, compass
"mode *#1111# FTA - and location in *#2222# ON *#0228# version
per version Shows touch devices
there, front screen loopback Bluetooth- systemic - - implemented microphone, test some time in the front information You are talking Information Checking - then - *#22558463# a - *#2663# dynamics.
main dimmed
mode Camera information vibrates
Dimming- device modules - - their system sound data
time replays cameras update and monitor
intermittent device *#9900# - NET Service Firmware
- - *#0011# conversational features
vibration usb speaker
*#9090# - mode
Testing *#06# - Shows

Service (they are also engineering, they are also secret) codes are used for quick access to various functions, often even hidden ones. There are universal codes for Android, and there are those that are available only for certain device models.

Not so long ago, I published an article in which I said,. To do this, you could use special software or use one of the secret codes. Now I will talk about the most popular of them, thanks to which you can carry out many system settings.

Popular secret codes for Android smartphones

Why are these codes called "secret"? It's just that most ordinary users do not need them, they are not published in the instructions for smartphones. First of all, "secret codes" are intended for engineers and developers to conduct various tests.

To use any of the service codes, you need to enter it in the dialer. On tablets, you will have to download a third-party application for making calls - enter the query "Dialer" in the Google Play search and download the dialer you like.

• *#06# - information about the IMEI of the smartphone
• *#*#4636#*#* - information about Wi-Fi, battery and usage statistics
• *#*#3646633#*#* or *#*#83781#*#* - enter the engineering menu on smartphones with an MTK processor (you can use it through it)
• *#*#8255#*#* - Google Talk service testing
• *#*#7594#*#* - if you enter this combination, after that, when you press the power button, the smartphone will immediately turn off, without offering a menu
• *#*#44336#*#* - information about PDA, CSC, build time and other data about the smartphone
• *#*#232338#*#* - Wi-Fi MAC address
• *#*#7780#*#* - instant reset to factory settings (Hard Reset). Removes only applications
• *2767*3855# - instant factory reset, but unlike the previous method, Android is completely reinstalled
• *#*#1234#*#* or *#12580*369# - information about device firmware
• *#*#1111#*#* - information about FTA software version
• *#*#2222#*#* - information about FTA hardware version
• *#*#0283#*#* - Loopback test
• *#*#0*#*#* - screen test
• *#0*# - testing various components: screen, camera, speakers, vibration, microphone and others
• *#*#0673#*#* or *#*#0289#*#* - audio test
• *#*#0842#*#* - vibration and backlight test
• *#*#232339#*#* or *#*#526#*#* - wireless network test
• *#*#1472365#*#* - GPS test
• *#*#1575#*#* - detailed GPS test
• *#*#232331#*#* - Bluetooth test
• *#*#232337#*#* - show bluetooth address
• *#*#2663#*#* - touch screen version
• *#*#2664#*#* - touch screen testing
• *#*#0588#*#* - motion sensor testing
• *#*#7262626#*#* - GSM signal test
• *#197328640# - switch to service mode
• *#*#3264#*#* - RAM version
• *#*#8351#*#* - activation of the voice dialing registration mode
• *#*#8350#*#* - turn off the voice dialing registration mode
• #*5376# - delete all SMS
• *#2222# - Android firmware version
• #*2562#, #*3851#, #*3876# - reboot smartphone, tablet
• *#34971539# - complete information about cameras and their firmware updates
• *#*#273283*255*663282*#*#* - quick backup of media files
• *#*#4636#*#* - secret menu for Motorola devices
• **05***# - Unlock PUK on Sony
• 3845#*855# - service menu on LG G3
  
• *#0011# - service menu on Samsung Galaxy S4
• ##778 (+ call button) - displays the EPST menu (for Samsung)
• ##3424# - diagnostic mode (for HTC)
• ##3282# - EPST (for HTC)
• ##8626337# - VOCODER (for HTC)
• ##33284# - network status technical data (for HTC)
• ##7738# - protocol revision (for HTC)

In principle, these are the most basic and universal service (secret) codes for Android tablets and smartphones, but all manufacturers add support for their own, so if you are interested in codes for a particular device, download the application. It will be discussed below.

Android service codes in the Secret Codes app

The Secret Codes app will scan the system for engineering codes and list the result. You just need to click on the code of interest and you will go to the desired option.

Unfortunately, this method has a disadvantage: on some devices, the application does not find a single service code, and on some it does not find everything. But on the devices I tested, everything was fine, and the reviews on Google Play are almost all positive.

Active users of mobile Android devices often face a situation when a fast and responsive device starts to "slow down" - installed applications take a long time to open, pages load slowly in the browser, the gallery "freezes" before opening, etc. This can be caused by the accumulated "garbage", which interferes with the work of programs.

We will consider how to solve the problem of clearing memory using the example of Samsung mobile devices.

Cleaning Android to default using the system menu (for example, Samsung Galaxy S2)

Let's prepare the phone for work first.

As a result of the procedure, all data will be deleted from the phone, therefore, before proceeding with the corresponding manipulations, you need to make backup copies of all information important to you - contacts, photos, programs, etc.

Check the condition of the battery, if necessary, charge to the maximum values.

Now completely turn off your gadget.

With the device turned off, you need to simultaneously hold down three buttons - the volume key to increase (up), the power button of the device and the physical button ("home") located below the display, as shown in the freeze frame below:

The phone will start to boot, but already in reset mode:

In the menu that opens, use the volume rocker to select " wipe data/factory reset»:

By pressing the power button, we confirm the action, after which a submenu will open, in which (also using the volume key "up" or "down") select the line " Yes - delete all user data", Press the power button, which activates the reset process in this case.

Now, when the menu appears, select the line " Reboot system now"(do not forget to confirm the action with the power button):

After the manipulations done, absolutely all information will be deleted from the smartphone (tablet), and with it what is called “system garbage”, the device will return to the “like from a store” state, automatically reboot, and we will only have to return the saved data.

Clearing memory in Samsung phones through the engineering menu

This feature does not exist on all Samsungs. You can find out by performing all the necessary actions for which the rights of the "superuser" (ROOT) are not needed. So what do we need to do:

On your smartphone, in the dialing line, enter the engineering menu code *#9900# and press the call button:

In the window that opens, select " Delete dumpstate/logcat»:

If this item does not appear, then due to the lack of a function in your device, you will have to use another method.

How to clear RAM (RAM) on Android using the task manager (for example, Samsung Galaxy S4)

A fairly simple way to clear memory is to use the built-in task manager. What actions should we take:

We press the physical button "Home", located in the center, at the bottom of the device and hold it for a couple of seconds to open the task manager. Then, click on the virtual button in the lower right corner to close all applications, after that, click on the button in the lower left corner, which will activate the deep cleaning process:

In the window that opens, a system message will appear stating what will be deleted as a result of the procedure. It remains to click on the "Clear memory" button:

How to clear Samsung phone memory using special software (ES File Explorer)

In order to apply this method, we need (or another file manager) and . Since we will be working with system files in this case, it’s worth recalling right away that rash actions can lead to sad consequences when your phone can be used for other than its intended purpose, but, for example, as a cool coaster for a cup of coffee, or what your imagination can tell you.

Now watch the video