• Android engineering menu, its capabilities and quick entry. Engineering menu in Xiaomi phones

    A beginner who bought a smartphone or tablet based on operating system Android, after a while, feels the need to reconfigure something in it or adjust it more precisely. Go to engineering menu Android is simple: just know the special commands.

    The hidden engineering menu in Android devices allows you to manage system settings of your smartphone or tablet that are not available in the standard menu. For example, they allow you to increase the speaker volume during calls, forcefully select the frequency range of the network being used, enable a photo or video format that is not in the main camera settings, etc.

    Parameters configured in the engineering menu

    Using the engineering menu you can access functions such as:

    • speaker or headphone volume;
    • improved speech recognition;
    • microphone sensitivity;
    • voice quality when making calls;
    • forced cellular network selection mode: “GSM only”, “WCDMA only”, “LTE only” (some network modes may not be available in the standard settings);
    • binding to one base station, frequency or channel number;
    • choice of technology and cellular data speed;
    • testing and overclocking the processor;
    • enable/disable sleep mode;
    • testing Wi-Fi and Bluetooth radio modules;
    • auto switching 2G/3G/4G in sleep mode;
    • camera test drive;
    • changing the photo format (default is JPEG or PNG);
    • fine-tuning the display brightness and its response to lighting;
    • locking/unlocking auto answer settings for incoming calls;
    • improved GPS performance;
    • full reset, including factory formatting of the smartphone;
    • testing and setting motion sensors;
    • testing color rendering on the display;
    • testing and setting up vibration alerts;
    • backup of multimedia files;
    • level determination harmful radiation(SAR) on a single device;
    • FM radio settings and behavior.

    Video: smartphone customization options through the engineering menu

    Commands for accessing menus

    Commands for accessing the engineering menu vary depending on the manufacturer. There are also common commands for all versions of Android that allow you to configure individual device functions.

    Main codes for entering the engineering menu

    The commands entered differ for different brands devices - select those that are suitable. It is not forbidden to check everything - commands that do not correspond to a specific manufacturer simply will not work.

    Table: commands for accessing the engineering menu of various manufacturers

    Google Commands for Android OS

    Android Factory Service Codes Showing technical information information about the device are often not linked to the manufacturer. Basically, they are all built into Android by default. Command “numbering” range agreed upon by Google- as the creator of the Android operating system - with manufacturers of tablets and smartphones.

    Table: Android factory service codes

    Parameter opened by typing code Code to be dialed
    Wi-Fi MAC address *#*#232338#*#*
    Information about the active WLAN network *#*#232339#*#*
    GPS check *#*#1472365#*#*, *#*#1575#*#*
    Bluetooth version *#*#232331#*#*
    Bluetooth MAC address *#*#232337#*#
    Loopback Batch Tests *#*#0283#*#*
    Touch screen version *#*#2663#*#* (test *#*#2664#*#*)
    Checking the motion sensor *#*#0588#*#*
    Checking the screen *#*#0*#*#*
    Checking the vibration alert and backlight *#*#0842#*#*
    Melody test *#*#0673#*#*
    RAM version *#*#3264#*#*

    The most popular service codes of the engineering menu

    The most popular codes, allowing you to change smartphone settings through the engineering menu, do not depend on the phone brand or Android version.

    Table: service codes for changing phone settings

    Called parameter or setting Service code
    To know serial number IMEI *#06#
    Settings and details *#*#4636#*#*
    Android OS version *#2222#
    Erase all SMS messages #*5376#
    Smartphone and battery usage statistics *#*#4636#*#*
    Reset settings Google account and others system utilities without removing pre-installed software. However, applications stored on the memory card (SD) will remain unchanged. *#*#7780#*#*
    Reset settings and clear user files from internal memory, reinstalling the smartphone firmware. You will not be prompted for confirmation, but you can have time to remove the battery - and then restore files and settings from backup copy using an application on your computer. *2767*3855#
    Information about the built-in camera and its settings. Firmware update. *#*#34971539#*#*
    Changing the mode of operation of the “End Call” button (“On/Off”). **#*#7594#*#*
    Show the file copy screen. You can back up all your data. *#*#273283*255*663282*#*#*
    Service mode - launching all kinds of checks (click on Menu), reconfiguring the smartphone in service mode. *#*#197328640#*#*

    When using commands, keep the following in mind:

    • By updating the camera firmware through the engineering menu, you can find out about the version of this firmware and the number of its updates - and also save this update to an image in the internal memory and on the SD card. It is not recommended to reflash the camera again - if it fails, you will simply ruin it;
    • when resetting the Android system, deleting all user Google data A message will appear on the screen asking you to confirm the reset.

    How to enter the engineering menu

    To get to the engineering menu, follow these steps.

    Video: how to open the engineering menu on Android

    What to do if you can’t enter the menu

    It happens that none of the commands intended for a specific brand of device is suitable - this is the manufacturer’s protection inexperienced users from not fully thought out actions. Some manufacturers after software debugging The engineering menu is completely removed from the smartphone, and all of the above commands simply do not work. For example, Samsung does this. Some of the commands entered can be harmful, such as software Android and the device itself.

    Often, instead of general service teams more specific ones work. If, despite all your attempts to “reach out” to the engineering menu, none of the service codes work, you need special applications.

    Install free application Mobileuncle Tools - it will differentiate between hardware and system settings. You may need to obtain Root access on Android. There are other applications: EngModeMtkShortcut, BetterCut, etc.

    How to save settings

    To ensure that settings made using engineering Android menu, have been preserved, you need to get out of it correctly. While in any section of the engineering menu, use the on-screen “Back” key either in the menu itself, or press the cancel call button or the “Back” key under the display - it is indicated as a reversal arrow - to go to a higher level of the engineering menu.

    It is not recommended to set the value of any setting and confirm it with the Set key, turn off or reboot the smartphone by pressing the power button, remove the battery from the device, etc. Exiting the engineering menu can involve pressing - sometimes holding for a few seconds - the same “Back” key below the display. When you exit the engineering menu, a message will appear on the smartphone screen asking you to save the settings you have made - confirm it. There are tips on some of the sections of the engineering menu:


    The reason why the engineering menu still does not save the settings may be “raw” firmware. Find out which Android versions and builds are right for your device. If you have a branded smartphone with a version of Android that has preinstalled programs and components from Beeline, MTS, MegaFon or Tele2 - feel free to install a “custom” version, for example, the well-known CyanogenMod assembly. Any earlier one may be suitable - or, conversely, the most “fresh” one - Android version.

    In some cases, it is impossible to enter the engineering menu without obtaining Root rights. The task is to make an Android smartphone “rooted”. In other words, get “superuser” capabilities on your smartphone, allowing you to take the smartphone under the clearest and most complete control. This is achieved in the following ways, use any of them.

    1. Install a custom (modified) version of Android on your smartphone. It already includes software component Superuser (“Superuser”), which provides access not only to the engineering menu, but also to system folder system.
    2. Download from Android Market any of the applications that perform hacking android without the help of a computer. Suitable here different programs: UniversalAndRoot, Unlock Root, z4root, Revolutionary, etc. Not all of them can help - you will have to test everything until it works.
    3. You can also try applications for Windows that perform all manipulations with Root access on a smartphone directly from the PC - for example, the VRoot program. You also need a USB-microUSB cable - it is impossible to hack Android on a smartphone via Wi-Fi.

    After receiving Root privileges, the smartphone is ready to activate the engineering menu using third-party Android applications.

    The more recent the version, the more settings in the engineering menu will be in Russian. In the earliest versions of Android (1.x, 2.x), all service settings were on English. Having learned a little technical English, you can easily remember the purpose of each of the settings and, if necessary, you can change them all in a few minutes.

    The availability of the engineering menu - in whole or in part - is decided not by the Android version, but by the make and model of the smartphone. Try different combinations and programs, but don't get too carried away.

    If you perform inept actions or forget the entered codes, there is a risk of turning your smartphone into a lifeless device, and only a service center will be able to restore it to you. And since if you “root” the device, you automatically lose the warranty.

    Android engineering menu is one of the most useful tools“advanced” user, preventing him from wasting the hardware resource of his device and the resource of cellular and wireless networks wasted. And it doesn’t matter what version of Android you have - 2.2, 4.2.2, 4.4.2 KitKat, 5.1, 6.0 or another - the engineering menu codes are determined only by the manufacturer. By completely subjugating your smartphone or tablet, you will deprive it of the opportunity to “live its own life” not according to your schedule, but according to the script of the manufacturer itself, mobile operators and other intermediary companies, one way or another involved in the operation of mobile equipment in cellular networks. This is the shortest path to professionalism.

    Everyone knows what an advanced user can do with the operating room. Windows system miracles. But not everyone suspects that Android can offer advanced capabilities. An experienced specialist can call up the engineering menu, in which advanced configuration of the device is carried out, as well as testing of certain of its functions. How to enter the engineering menu on Android - read below.

    IN modern versions operating system has a fairly full section " Settings" With it you can adjust a variety of parameters. But some of them still cannot be deeply customized. Such parameters should be looked for in the engineering menu. For example, specialists from service center can enter the engineering menu in order to adjust the volume of the speaker, headphones and built-in microphone.

    In short, the engineering menu contains system settings that should not be available to the average user. The Android engineering menu can easily ruin a smartphone if you change its parameters almost at random. With its help, you can often even change the font size, increase the number of icons on the desktop and make other system changes. On some smartphones, the engineering menu changes the strength of signal reception, the type of vibration and other aspects of the device’s operation.

    Interestingly, the easiest way to get to the engineering menu is on Android 4.4 and later versions of this OS. The hardest thing to do is get into such a menu on Android 2.2. More often early versions The operating systems were not equipped with an engineering menu at all - that is why they were practically impossible to customize. There are problems with this on the newest devices as well.

    The fast and easy way

    It should be noted that to open the engineering menu you do not need any third party program. You don't even need root access! You just need to dial virtual keyboard a special combination - the so-called engineering menu code. The problem is that many manufacturers use their own code; there is no universal combination. Sometimes the code is different even for different models, released by the same company!

    First, you should find the section where you dial a telephone number.

    If the engineering menu is not displayed, try pressing the call key after entering the combination.

    By the way, owners of devices based on the MediaTek MT6573, MT6577, MT6589 and some others chipset can download the application MTK engineering menu. As you might guess, the utility will allow you to launch the corresponding menu without entering a numeric code.

    If you can't enter the menu

    It is quite possible that you will try to enter all the above combinations, but will not get into the engineering menu. This happens on Android 6 and some others are enough latest versions operating systems. Apparently, the engineering menu is locked, or some specific code is required to call it.

    Hello friends, you are watching the Mobbiver channel and today we will talk about the so-called engineering menu based on MTK processors. Namely, about its useful functions... I would like to warn you right away that we do not bear any responsibility for the damage that you may cause to your gadget! I advise you to write down all factory settings before changing them. There are two ways to enter the engineering menu: 1) Using a specialized code (*#* #3646633 #*#*). 2) Special software. Access code different manufacturers may vary. Or it may be blocked by the manufacturer. Settings in the BandMode menu. In this menu you can enable or disable different standards communications. Such as GSM Mode: EGSM900, DCS1800, PCS1900, GSM850. UMTS Mode: WCDMA-GSM-900, WCDMA-CLR-850, WCDMA-PCS-1900, WCDMA-IMT-2000. LTE Mode. Additionally, it is necessary to do for the second sim cards, if the smartphone is dual-SIM. This will save battery power. Which will increase the autonomy of the smartphone. In the Network Selecting item, you can select your preferred communication networks. Auto – will select networks with the highest speed In the Connectivity section. If you select CDS Information, you will have the opportunity to restore the IMEI code of your smartphone. This is done in the Radio Information item. IMEI code must be registered for both the 1st SIM card and the second. In the AT+ column enter EGMR=1.7, and IMEI code. For the second AT+ SIM card, enter EGMR=1.10 and IMEI code. Save the changes and reboot the phone. You can configure the speaker in the Hardware Testing section. Select the Audio item. Customize sound conversational dynamics can be found in the Normal Mode menu. In the Type item, select Mic to configure the microphone. Set up the speaker in Sph. Setting the headphone sound in the Headset Mode section. You can adjust the sound when talking in headphones, the microphone of the headphones and the Media sound. LoudSpeaker Mode - adjusts the sound of the external speaker. Ring volume, playback of audio files. In the Camera section you can do additional settings cameras. Capture Size adjusts the quality of the photo. You can also adjust ISO. In the Log and Debugging section. The MTKLogger item records information about Android work smartphone. And sends work reports. By turning off this process you can save battery power. And there will be more free memory. The MTK Logger folder can be deleted. On the Mobbiver channel ( https://www.youtube.com/channel/UCkLz2FK04dksd6lNVxASyiQ) you will see reviews of smartphones, tablets, phones, Bluetooth headsets, power bank and other accessories. The video will include disassembly and minor repairs. We will do reviews, comparisons and talk about personal experience uses and our conclusions. Highlight the pros and cons. Be with us on the Mobbiver channel, subscribe to the channel, advise your friends. Track used in the video: Riot-Safety Net

    Have a nice time! Today our task is to find out what kind of program Engineer Mode is. I went looking for information on the Internet. We have the first data. In general, Engineer Mode is an engineering menu that has a lot of settings, and it says that almost everything can be configured! Do you know what thought immediately came to my mind? Guys, there are a lot of settings, but it seems to me that you should only get into these settings when you understand exactly what you are doing! After all, this is an ENGINEERING MENU after all... not a joke...

    You do not need root rights to open the engineering menu. You can enter this menu using the program, or enter a special code. I'm not sure guys, but it seems like not all phones have this menu! This menu is definitely available for phones that have an MTK processor, even have special programs for these phones, such as ToolHero, Mobileuncle MTK Tools. In short, such a small hit, this menu is not available everywhere, keep this in mind...

    Although it’s still a little surprising to me.. The fact is that I looked on the Internet and many sites there write that you can access this menu from many phones. In short, it’s not clear... I found a picture and it shows what combinations you need to enter to open the engineering menu on different phones, look:

    Well, if you have a phone with an MTK processor, then, as I already wrote, you need to use the Mobileuncle MTK Tools or ToolHero application, basically as I said above. However, here I read again: in order for these normal applications to work, you need root rights. It turns out that applications need root rights, but to call the engineering menu using a special command, root rights are not needed. If I understood everything correctly, then the situation is as follows. But I found a picture, well, it shows how to enter the code (but each manufacturer has its own code, don’t forget):

    By the way, I found a picture, this is the Mobileuncle MTK Tools application, look:

    Well, here’s what ToolHere looks like, look:

    Well, here is the EngineerMode menu itself:

    Look guys, I dug up this picture, look carefully:

    Here we see that the Hardware Testing tab is active, this is a type of hardware test, and here what do we see? We see audio settings, camera settings, there is even a stress test for the processor (CPU Stress Test), screen settings, in short, much that is in the engineering menu.. Once again I was convinced that in order to touch something, you need to fumble around in it. Guys, don't play with this menu out of nothing to do, it's not a toy.

    Well guys, do you understand what Engineer Mode is? As you can see, it turned out that this is not a program, it’s an engineering menu, you can also say that it’s a service or service menu. But have you thought why it is needed at all? But I asked. In short, this menu is like secret settings, which are used by specialists at the factory to optimally configure the phone so that everything works normally. Therefore you must understand that incorrect settings may make the phone inoperable.

    That's all, gentlemen. Good luck and positive thinking!

    Manufacturers of Android smartphones implement and use the engineering menu to test devices. It contains all kinds of tests and device settings that are not available to ordinary users. However, today, knowing the USSD command or downloading the application from PlayMarket, anyone can go to the engineering menu.

    Why do you need a hidden engineering menu in Android?

    Engineering menu (Engineering Mode) – at its core hidden application, which is used by developers for testing and installation optimal parameters mobile phone or tablet. Specialists check the operation of the sensors and, if necessary, make adjustments to the functioning of system components.

    When working with the Android technical menu, be careful - changing some functions leads to malfunctions of the device.

    How to enter the menu

    To open the menu installed by the manufacturer, activate the dial pad on your smartphone and enter one of the USSD commands presented in the table. After entering the command, the numbers will disappear from the screen and a menu will open instead.

    In the dial pad, enter a combination of numbers and symbols to enter the menu

    Table: combinations for launching Engineering Mode

    Device manufacturer Team
    Sony *#*#7378423#*#*
    *#*#3646633#*#*
    *#*#3649547#*#*
    Philips *#*#3338613#*#*
    *#*#13411#*#*
    ZTE, Motorola *#*#4636#*#*
    HTC *#*#3424#*#*
    *#*#4636#*#*
    *#*#8255#*#*
    Samsung *#*#197328640#*#*
    *#*#4636#*#*
    *#*#8255#*#*
    Prestigio *#*#3646633#*#*
    LG 3845#*855#
    Huawei *#*#2846579#*#*
    *#*#14789632#*#*
    Alcatel, Fly, Texet *#*#3646633#*#*
    Smartphones and tablets with a MediaTek processor (most Chinese devices) *#*#54298#*#*
    *#*#3646633#*#*
    Acer *#*#2237332846633#*#*

    Video: how to work in Engineer Mode

    If the code does not work and in a standard way it is not possible to start the service menu, use third party applications- You can download them on PlayMarket. Recommended programs - “Starting an engineering MTK menu", Mobileuncle Tools, Shortcut Master.

    The manufacturer menu does not work on some device models with Android 4.2 JellyBean (x.x.1, x.x.2), as well as on Android 5.1 Lollipop. The menu is also invalid when installed firmware Cyanogen Mod. In Android 4.4.2, when you reboot, changes made in the application are reset.

    “Launch the MTK engineering menu”

    The application allows you to open and configure the engineering menu without typing digital commands. Works correctly on MediaTek processors(MT6577, MT6589, etc.) and Android systems 2.x, 3.x, 4.x, 5.x. According to user reviews, the program successfully performs its functions, but after rebooting the smartphone, the settings made using the application are reset.

    Mobileuncle Tools program

    The functionality of the application is similar to the previous one, but, in addition to accessing the engineering menu, the user has the opportunity to view information about the screen, sensor and device memory, as well as update the firmware, restore the IMEI number and improve GPS. For stable operation, root rights are required.

    To enter the engineering menu, select Engineer Mode

    Shortcut Master utility

    The Shortcut Master program is designed to work with shortcuts and system applications: creation, search, deletion. It does not have a direct function for entering the engineering menu. But with its help you can view the list secret commands, valid on your device. And by clicking on the name of the command, you will see a drop-down menu in which there will be an item “execute”. Convenient and does not require unnecessary actions.

    In the program call additional menu and select Secret code explorer to see a list of codes

    Root rights to access the engineering menu

    To get to the service menu on some versions of Android, the user must have superuser rights (root). You can obtain rights using specialized applications: Farmaroot, UniversalAndRoot, Romaster SU and others. To get Root access to your device using Farmaroot:

    1. Install and run into the program. Link in Google Play: https://play.google.com/store/apps/details?id=com.farmaapps.filemanager&hl=ru.
    2. If the application supports installing root rights on your device, then you will see a list on the screen possible actions, among them - “Get root”. Select this item.
    3. Choose one of the preset root methods.
    4. The program will begin installation.
    5. At the end of the procedure, you will see a success message. root installation access.

    Instructions for obtaining root access through the Farmaroot application

    Possible problems and solutions:

    • the application closed mid-installation - restart the device and try again;
    • root rights are not installed - try installing using a different method (select a new exploit in the application).

    What can be configured in the menu

    Appearance engineering mode and options for adjusting settings may vary depending on the tablet or smartphone model. In the menu, users most often adjust the sound, change camera settings and use recovery mode. The parameters for adjustment and the procedure are given below. Be careful - menu item names may vary depending on various models devices! You act at your own risk.

    Audio: Increase volume level

    If your phone does not ring loudly enough, in the engineering menu find Audio section and go to LoudSpeaker Mode. Select Ring. For each signal level (level 1–6), change the values ​​- set the numbers in ascending order, from 120 to 200. Increase the value in the Max item. Vol - maximum 200. Press the SET button to save the settings.

    Change the values ​​one by one maximum volume for each level

    Audio: Increase phone call volume

    To enhance the speaker tone for conversations, see service menu Audio select Normal mode and open Sph. Set the values ​​for signal levels (level 1–6) from 100 to 150, and the number for Max. Vol. – up to 160.

    By adjusting the speaker volume, you will be able to hear your interlocutor better during a call.

    To increase the sensitivity of the microphone, go to the menu Audio - Normal mode - Mic. For each level assign same values microphone sensitivity, for example, 200. Press the SET button, reboot and check whether the other party can hear you better.

    Increased microphone sensitivity will allow the other person to hear you better

    Video: adjusting sound parameters in the engineering menu

    Battery: Disable unused frequencies

    Smartphones quickly consume battery life running applications, maintaining cellular communications And network connections. Using the engineering menu you can increase the battery life.

    Modern devices scan several GSM frequencies - 900/1800 MHz and 850/1900 MHz. In Russia there is a pair of 900/1800 MHz, which means there is no need to scan the network at other frequencies. The radio signal for the second pair can be turned off, which will significantly save the charge level.

    In Engineer Mode, open Band Mode. Disable unused frequencies, unchecking the corresponding items - PCS1900 and GSM850. If the device supports two SIM cards, open the SIM1 and SIM2 items one by one and perform the indicated steps in each. Press the SET button to save the settings.

    Disabled frequencies save battery power

    If your smartphone and SIM card operate in 3G networks, disable the networks that are not used in Russia: WCDMA-PCS 1900, WCDMA-800, WCDMA-CLR-850. Press the SET button again.

    You can enable scanning of disabled networks by returning to the same menu and checking the boxes.

    Camera: photo and video settings

    By default, Android devices save pictures in JPEG format. Meanwhile, photographers prefer to shoot and process material in RAW to gain more editing options. The technical menu allows you to select the desired image format.

    Find Camera in the menu and select Capture Type. Set the photo format to RAW and press SET. Also in the Camera menu you can increase the size of pictures, set the ISO value, enable shooting in HDR for higher photo detail, and set the frame rate for videos. After changing each parameter, remember to press SET to save the settings.

    Recovery Mode

    Recovery Mode(Recovery mode) – analogous to Bios on a computer, allows you to control the device without logging into Android system. Recovery mode features:

    • resetting settings to standard;
    • firmware update;
    • access to root rights;
    • creating a backup copy of the OS;
    • removal of personal data from the system.

    In Recovery Mode, do not perform an action if you are not sure what it will lead to. Some commands may harm the device and system.

    If the settings are not saved

    Users who have access to the technical menu complain that the parameters changed in it are not activated or are reset when the device is restarted.

    To activate the settings after changing the parameters, tap on the SET button at the bottom of the screen. If the parameters are reset after rebooting the device, try accessing the technical menu not through the application, but using a digital command.

    After setting the settings, do not forget to press the SET button

    Service codes for Android devices

    Besides technical menu, secret USSD codes allow you to control the functionality of Android smartphones - combinations of numbers and symbols, by typing which the user performs an action. Secret codes For different devices are given in the table.

    Table: list of secret commands for Android

    Manufacturer Digital Team Meaning
    Codes for most manufacturers *#*#7780#*#* Rolling back settings and uninstalling user applications
    *2767*3855# Firmware change, total settings rollback.
    *#*#232339#*#*
    *#*#526#*#*
    Checking wireless connections
    *#*#34971539#*#* Camera details
    *#*#232338#*#* View Wi-fi address
    *#*#273283*255*663282*#*#* Activating media backup on your phone
    *#*#1472365#*#* Express GPS test
    *#*#0*#*#* Checking the screen
    *#*#2663#*#* Viewing touchscreen information
    *#*#2664#*#* Touchscreen testing
    *#*#4636#*#* General device and battery data
    *#*#0673#*#*
    *#*#0289#*#*
    Audio tests
    *#*#7262626#*#* Checking GSM reception
    *#*#0842#*#* Vibrate and display brightness test
    *#*#3264#*#* RAM information
    *#*#232331#*#* Testing Bluetooth Communications
    *#*#8255#*#* Checking Google Talk
    *#*#232337#*#* Bluetooth address information
    *#*#1234#*#* Device firmware data
    *#*#44336#*#* Device build date
    *#06# IMEI number information
    *#*#197328640#*#* Service activity test
    *#*#1111#*#* Free-to-air version of programs
    *#*#2222#*#* Iron number for free-to-air
    *#*#0588#*#* Checking the proximity sensor
    Sony (devices use the same commands) **05***# Unblocking a PUK code
    Motorola *#06# IMEI
    *#*#786#*#* Reverting settings to original
    *#*#1234#*#* *#*#7873778#*#* Opening applications with root rights
    *#*#2432546#*#* Checking for updates
    *#*#2486#*#* Entering the service menu
    HTC *#*#4636#*#* Service menu
    ##3282# EPST System Application
    *#*#8255#*#* G-talk monitor
    ##33284# Network status
    *#*#3424#*#* Functionality test
    ##3424# Device diagnostics
    ##7738# Protocol diagnostics
    ##8626337# Voice Coder
    Samsung (generic codes are effective) ##778 (+call) Activation of EPST menu
    LG (working with codes is replaced by the technical menu) 3845#*855# International devices
    3845#*400# Chinese devices
    5689#*990# Sprint
    ##228378 (+ call) Verizon Wireless
    3845#*851# T-Mobile
    3845#*850# AT&T

    If for some reason service code didn’t work, don’t be upset - install and run the Secret Codes application (Link on Google Play: https://play.google.com/store/apps/details?id=fr.simon.marquis.secretcodes&hl=ru). The program will analyze the combinations active in the device and offer you a list. You can activate the combination directly in the application with one click on the name.

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