Not many people know about the existence of a menu with advanced device settings in the Android OS - engineering menu . And someone knows, but does not know how to enter it and what to do with it.
In this article, we will show how to enter the engineering menu and some of its features.

You can enter the engineering menu simply by writing special team(but it must be added that this method does not work on all versions of Android and not on all devices)

The command to enter the engineering menu: *#*#3646633#*#*

Also, on some versions of Android, the command may work *#15963#* and*#*#4636#*#*

Immediately after entering, the command should disappear and the engineering menu will open. But on some devices, you still need to press the "Call" key

If this method does not work, you can use the alternative!

And it consists in installing the program (which, by the way, is freely available on Google Play) " Mobileuncle MTK Tools 2.4.0"

This program will open access to the engineering menu (that is, it will work similarly to a set of combinations*#*#3646633#*#*)

There are a lot of settings! The scope for experimentation is huge! You can debug and adjust almost EVERYTHING!

For clarity, let's briefly analyze the volume setting of the device:

We go into the program ---> select the section "Engineer Mode"

Because we are interested in setting the sound level, select ---> "Audio"

And voila, the menu of interest to us opens.

Max Vol - the same for the entire subsection, as a rule, it is set to 150 (you can change 0-160 - it changes if you select the Media item in the subsection).

If in some submenu, for example, Audio - Normal - Sph, the overall level is not available for adjustment, then enter another submenu, for example, Audio - Normal - Media - there you will be able to adjust the overall volume level.

Sub-points:
Sph - volume levels during a telephone conversation,
Mic - microphone sensitivity levels,
Ring - call volume,
Media - volume when playing music, movies, games.

Ring volume levels are set in Audio - LoudSpeaker - Ring
MaxVol=150
Levels: 120 130 145 160 180 200 (more starts wheezing)

Conversation volume levels in the phone speaker in Audio - Normal - Sph
MaxVol=150
Levels: 100 120 130 135 140 145 150

Microphone speaking volume levels in Audio - Normal - Mic
Levels: 100 172 172 172 172 172 172

Media volume levels are set in Audio - LoudSpeaker - Media

Levels: 110 130 160 190 210 230 250

All the same can be configured for the Headphone mode, by analogy:

Speaker volume levels are set in Audio - LoudSpeaker - Sph
Max Vol = 150 (it is the same for the entire section)
Levels: 80 100 110 120 130 140 150 (more starts wheezing)

Now all volumes are regulated in adequate ranges.
If you are not satisfied with the volume levels, you can set your own values ​​(the larger the value, the greater the volume when adjusting the volume keys, or the greater the microphone sensitivity)

By analogy, you can customize most sections! Experiment!

The term "secret codes for Android" refers to such combinations of characters that were originally intended to test devices on which this operating system is installed.

With their help, developers check phones and tablets before they are sent for sale. And their total number reaches several tens.

The introduction of a certain sequence allows you to get data or perform actions that are not available to ordinary users.

Content:

Features of "secret" ciphers

Many users who are faced with the need to use such commands may wonder why they are secret.

First of all, combinations of symbols and numbers received such a name due to the fact that most owners do not need them.

And there is no mention of these commands in the instructions.

To use any of them, you need to enter the "Phone" application in the dialer (green or blue handset on the main screen).

Tablets without a 3G module do not have this feature by default.

And in order to run the codes, the user must download special application, finding it in the query "Dialer".

Combinations for any Android gadget

Information sequences allow obtaining data on various characteristics of the device and its individual elements:

• *#06# – about the IMEI number;
• *#*#4636#*#* - about the battery and the Wi-Fi network;
• *#*#44336#*#* - about the firmware, including the CSC number and build date;
• *#*#232338#*#* – about the wireless network address;
• *#34971539# - about the cameras of the gadget;
• *#*#1234#*#* (although *#2222# works much more often) - about the firmware.

When you enter *#*#1111#*#* you can get the software version information on the screen.

Introduction *#*#2222#*#* shows information about the board.

Information about the version of the sensor will show the code *#*#2663#*#* , about RAM - *#*#3264#*#* , and the Bluetooth address data is *#*#232337#*#*.

Commands for Verification and Tests

To test the device, there is a group:

• Google Talk service check ensures consistency *#*#8255#*#* ;
• to check the operation of the display - *#*#0*#*#* ;
• for testing different parts (from camera to microphone) – *#0*# ;
• for the audio test - two at once: *#*#0673#*#* and *#*#0289#*#* .

You can check the operation of the backlight and vibration by entering a combination *#*#0842#*#* .

Testing with command *#*#232339#*#* and additional *#*#526#*#* .

Verification is performed by sending commands *#*#1472365#*#* (for a regular test) or *#*#1575#*#* .

The Bluetooth network is checked via *#*#232331#*#* .

A few more useful commands allow you to test the performance of the screen ( *#*#2664#*#* ), motion detectors ( *#*#0588#*#* ) and GSM module ( *#*#7262626#*#* ).

And the input *#197328640# provides a transition to the service mode.

Dangerous Combinations

There are several options, by entering which, you can make serious changes to the system without the ability to return to its original state.

These include, for example *#*#7780#*#* and *2767*3855# .

The first one provides a reset of all settings and removal of applications installed by the user, the second command leads to a complete reinstallation of the system.

Combination *#*#7594#*#* allows you to get rid of the shutdown menu - when you click on the corresponding button, or will automatically turn off without asking the user anything.

Code selection *#*#8351#*#* needed to enable voice dialing registration, and *#*#8350#*#* – to disable this mode.

Subsequence #*5376# is used to delete messages, and several combinations for Android type #*3876# , #*3851# and #*2562# restart the gadget.

Special codes for products of individual manufacturers

There are several combinations that are only suitable for certain models or brands of gadgets. They can be summarized in a small table.

Tab. 1. codes for certain models mobile devices on Android OS.

brand, model	Team	Action
Sony	**05***#	PUK code unlock
LG, G3	3845#*855#	service menu entry
Samsung Galaxy S4	*#0011#	go to menu
HTC	##3424# ##33284#	start the diagnostic process network status information
Motorola	*#*#786#*#* *#*#2486#*#*	reset all settings go to built-in menu

In addition to these, there are other commands. A special Secret Codes application from PlayMarket will help you find them. With it, you can even find those that are not on the list.

You should know: Not all of the sequences, even universal ones, will work on every smartphone. The use of a secret combination can be limited either by a self-reinstalled operating system, taken not from the official site, but from third-party sources.

Results

Most of them should be used very carefully. Especially, those of them that not only give out some information, but also make changes to the operating system or firmware.

When used correctly, they can be quite useful.

Secret codes are certain combinations of characters, by entering which you can get this or that information or access to some hidden functions. It is impossible to predict when and in what situation these codes may be needed, but it is better to familiarize yourself with them in advance.

So, secret codes for Android smartphones and other devices will help you find out additional or hidden information about the hardware of your mobile device, perform a full reset, and so on. You should be careful when using them - often the changes are irreversible, and, for example, after resetting the settings to the factory settings, you will have to restore them back completely manually. Well, let's analyze all the secret codes in order.

*#*#4636#*#*

This code will display on the screen information about the mobile gadget, its battery, battery history, and device usage statistics.

*#*#7780#*#*

The code completely resets to factory certain settings, including settings Google account, which is stored in the device, settings and data operating system and various installed applications, removes downloaded apps. Not being deleted system applications and programs that are available immediately, "out of the box", as well as data on the memory card, such as photos, videos, music, and so on. Before resetting the settings to the factory settings, the user is asked for confirmation, so that even if the code is entered by mistake, it may not confirm its execution.

*2767*3855#

The code that is used for factory formatting. At the same time, it happens complete removal absolutely all files and settings, including those stored in the internal memory. This secret code also reinstalls the firmware of the Android device. After its introduction, the only way to prevent unwanted consequences is to quickly pull out battery from a mobile gadget and recover data using a computer.

*#*#34971539#*#*

Secret code to access the built-in camera of a mobile device. After its introduction, access to 4 menus appears: updating the camera firmware (it is strongly not recommended to perform this action, very often choosing this option leads to errors or failure of the camera), updating the camera firmware on the memory card, obtaining basic information about the current camera firmware, camera firmware update history.

*#*#7594#*#*

Code for changing the actions on pressing the "End Call" or "Enable / Disable" keys. Usually, by default, when you long press the button, a menu appears that gives you a choice of actions such as switching to silent mode, airplane mode, or turning off the device. You can change the actions with a normal press to direct shutdown.

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

Code to call me to copy files, it can be used to execute backup media data stored in the memory of the mobile device, such as photos, songs, and so on.

*#*#197328640#*#*

Secret android code to call the service mode, with which you can run various tests and change charging settings.

*#*#8255#*#*

Launching the GTalk service screen.

*#*#232339#*#* or *#*#526#*#* or *#*#528#*#*

Secret codes to run WLAN tests on Android devices. To run tests, press the "Menu" button.

*#*#232338#*#*

This code shows the WiFi MAC address of the mobile device.

*#*#1472365#*#* or *#*#1575#*#*

Code to run device GPS tests

*#*#232331#*#*

Built-in Bluetooth test.

*#*#232337#*#

A code that displays the Bluetooth address of the mobile device.

*#*#4986*2650468#*#*

Code for getting information about PDA firmware, smartphones, H/W, RFCallDate.

*#*#1234#*#*

Code for obtaining information about the firmware of smartphones or PDAs.

*#*#1111#*#*

Display FTA SW version.

*#*#2222#*#*

Display FTA HW version.

*#*#44336#*#*

Display information about the firmware of smartphones, PDA, CSC, Changelist number, built-in time.

*#*#0283#*#*

Launch Packet Loopback.

*#*#0*#*#*

Run the built-in LCD test.

*#*#0673#*#* or *#*#0289#*#*

Code to run the audio test.

*#*#0842#*#*

Secret code to test the backlight and vibration of a mobile device.

*#*#2663#*#*

Code for displaying the touch display version.

*#*#2664#*#*

Code to run the touch screen test.

*#*#0588#*#*

Code to perform a sensor test.

*#*#3264#*#*

Display the RAM version.

*#2663#

Screen sensor calibration (press update).

*#2263#

Switching GSM/3G bands.

Passcodes are quite powerful tools for displaying information and performing certain actions on your smartphone, so you need to use them carefully and wisely. In general, these codes work on most mobile devices running an operating system. Android systems.

The engineering menu provides access to manual configuration of the "iron" part of the smartphone. To enter, you need to enter a special code or install an application, but there are a number of features that you should pay close attention to. If you could not enter the engineering menu the first time, then you did not take into account the features of the device. It should immediately be clarified that any intervention in the operation of the device can lead to its inoperability and loss of warranty.

Hidden system features

At the last stages of smartphone setup, developers test the system for errors and check the operation of all device sensors. Especially for this, a special subroutine is sewn into Android - the engineering menu, which provides access to hidden settings Android OS and allows you to reconfigure them yourself. In addition, the menu contains detailed information about the device. The full list of menu options is known only to platform developers, so you should make your changes with caution.

Secret paths of developers

To enter the engineering menu, dial the code *#*#3646633#*#*. On some models, you additionally need to press the call key. It is worth considering the features of phones: for different brands there are different combinations of numbers. The Android version does not affect the functionality of the engineering menu.

We enter a special code to enter the engineering menu

If there are no problems, then you will be taken to an additional menu for fine-tuning your smartphone.

Enter the menu subsection

Depending on the system version and processor model, the engineering menu may be incomplete or missing. In the photo above, a menu subsection with elements for testing smartphone sensors, setting up a USB connection, performing internal and external memory tests.

If it didn't work the first time

Not on all devices it is possible to enter the engineering menu. Let's look at some common problems and how to fix them.

Android is a complex Unix-based operating system. If something cannot be done, you have not taken into account all the nuances of the functioning of a particular subroutine.

List of special codes

One of the common reasons for blocking the entrance to the engineering menu is the wrong special code. The combination of numbers depends not only on the device model, but also on the type of processor. For example, most devices based on the MTK chip are equipped with an engineering menu. If we talk about Qualcomm, not all smartphones based on this platform have an engineering menu. The list of combinations is given in the table. If you don't like the one you want, try another combination.

Table: code options for different Android models

DIY engineering menu

If none of the special codes fit, don't get upset. There are many applications on the network with the functionality of the engineering menu. It is worth noting that the postscript MTK in the names speaks eloquently of compatibility only with MediaTek processors.

The first option is Mobileuncle MTK Tools. In this program, in addition to the necessary set of settings, there are several additional features: firmware update, recovery update, GPS receiver upgrade mode and more.

Mobileuncle MTK Tools provides a set of settings

Another program is MTK Engineering Mode. The program completely repeats the regular engineering menu.

MTK Engineering Mode repeats the regular engineering menu

For those whose device is not equipped with an engineering menu, there is another option: installing third-party firmware. Third-party builds very often have a wide range of customization options.

Where to begin

When you first enter the menu, you can get lost in the wilds of parameters.

Engineering menu settings

Settings open up huge possibilities for users.

Depending on the hardware platform, some items may not be available or may be missing.

In this section, you can configure settings mobile communications.

1. Auto Answer. Enable/disable automatic answer to an incoming call.
2. band mode. Lets in manual mode select the frequency range for the operation of the GSM module. You will see all technologies and frequencies for them supported by your smartphone model. If you wish, you can uncheck the ranges that are not used by your carrier. This will significantly save battery power. To save the settings, press the set button.
3. CFU Setting (Call forwarding Settings). This option enables or disables conditional forwarding. It must be supported by the operator.
4. AT Command Tool. A developer utility that supports AT commands. This menu item will be of interest to programmers and developers. Using this menu, you can perform various queries directly on the system without visual add-ons.
5. modem test. Setting the compatibility of the "access point" option with different types of connected devices.
6. network selection. Here you can select mobile communication standards (GSM, WCDMA, LTE). For additional energy saving, disable unused ones.
7. NetworkInfo. Select one or more options to display information about the state of the parameters cellular communication. After selecting, open the additional menu (three dots on the right in the upper corner) and click Check Information. This option is convenient for checking the quality of services of a mobile operator.
8. GPRS. Setting up a connection to the mobile Internet, selecting an active SIM card (if there are several).
9. HSPA info. Information about the 3G network if supported by your mobile operator.
10. Mobile data service preferred. The Internet will be prioritized over voice traffic to increase the data transfer rate. Incoming calls may not go through.
11. Fast dormancy. Allows you to save battery power in third-generation networks. The option must be supported by the carrier.
12. RAT Mode (Phone Info). Allows you to select the preferred communication standard. You should change the parameter carefully, it blocks the settings of the Network Selecting item.
13. RF De-sense Test. You can select a frequency range and a specific channel to check the quality of communication.
14. SIM ME Lock. This subsection allows you to configure the regional parameters of the GSM module (MNC, NCC) in manual mode.

Photo gallery: mobile communication options

We get into the main window of the subsection Turn on or turn off auto-answer Turn on or turn off conditional forwarding Set up the “Modem” mode Display information from the GSM module Set up Mobile Internet We select the priority of the connection type We configure the operation of the 3G mode We select the type of mobile connection We check the network capacity We configure the regional communication parameters

Wireless interfaces

The section is intended for testing wireless data transmission modules (Wi-Fi, Bluetooth, FM).

1. bluetooth. A wide range of settings and tests for the module of the same name in order to check the reception and transmission of data, start the debug mode.
2. CDS Information. Information about the parameters of wireless interfaces.
3. FM receiver. Checking the FM module of the device.
4. WiFi. Testing the module for transmitting and receiving information on the specified frequency channel.
5. WiFi CTIA. Recording logs of wireless technology tests.

Photo gallery: wireless data transmission

We select the section for checking the wireless modules of the device We check the bluetooth operation mode We find information about wireless interfaces We configure the FM module We check the operation of the WiFi module We write data about the WiFi module test to the log file

1. Audio - fine-tuning the sound playback parameters.
2. Camera - a set of options for taking photos and videos that are not included in the Camera application.
3. Driving Current Camera - takes current readings from the sensor in the camera circuit.
4. CPU Stress Test - execution of tests of all subsystems of the central processor.
5. Deep Idle Setting - disable sleep mode in standby mode.
6. Sleep Mode Setting - sleep mode settings.
7. ChargeBattery - view information about the battery.
8. Sensor - sensor calibration.
9. Multi-Touch - checks the number of available points for simultaneous touching the screen.
10. Location Engineer Mode - checking the parameters of the GPS module.

Photo gallery: equipment testing

We go to the section for checking electronic components Adjust the volume of the earpieces Adjust the power supply of the camera Adjust the standby mode Adjust the frequency of the central processor Adjust the sleep mode View battery information Configure touch screen Checking the capabilities of the multitouch function Setting up the GPS module

Adjusting the speaker volume

In the subsection, you can adjust the overall volume level, the volume of the headphones and the speakerphone.

Changes in volume settings should be treated carefully. All parameters are individual for a specific device model. Incorrect configuration may result in poor hearing performance.

There are a number of general options:

1. MaxVol - the overall volume level. The range of values ​​is from 0 to 160. The larger the number, the louder the volume.
2. Sph - volume during a telephone conversation.
3. Mic - microphone sensitivity.
4. Ring - speaker volume for an incoming call.
5. Media - volume level when watching movies, listening to music and playing games.

Very often, users are unhappy with the volume of the speaker during a conversation. To improve audibility, go to the Normal Mode menu and change the Sph parameter to 150. If the phone rings quietly when incoming call, then you need to increase the value of the Ring parameter. We advise you not to set a value higher than 200, this can lead to speaker failure. To hear you better, change the Mic parameter from 100 to 172. This will increase the speaker's sensitivity.

ROOT - a panacea for a smartphone

On a smartphone without root rights functionality The engineering menu is limited: some items are not displayed, the changes made are not saved. Any interference with the operation of the smartphone requires open access to the system. Do not forget that getting root access can harm your gadget, the warranty on the device is void. We strongly recommend that you back up important information to a memory card and synchronize with a google account and remove it to avoid data loss. To unlock full access to the system, you can use one of the existing methods.

Installing the application directly on the device (KingRoot)

Superuser access can be opened from a smartphone using special programs. Consider the sequence of operations on the example of the KingRoot program:

After that, you can safely change the parameters in the engineering menu, all changes will be saved. If the result is negative, move on to the next method.

Obtaining superuser rights via PC (Kingo Root)

This method differs in a slightly larger number of preparatory activities:

The engineering menu is used to configure the device and test the hardware. This is a built-in subroutine of the system, which is an indispensable tool for both experienced users and beginners in the world of mobile devices. However, it should be noted that manipulations with the engineering menu can render the gadget inoperable.

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

The hidden engineering menu in Android devices allows you to control the system settings of your smartphone or tablet, which are not available in the standard menu. For example, they allow you to increase the volume of the speaker during calls, force the frequency range of the network 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” (in the standard settings, some network modes may not be available);
• binding to one base station, frequency or channel number;
• choice of technology and speed of cellular data;
• testing and "overclocking" of the processor;
• enable / disable the "sleep" mode;
• testing of radio modules Wi-Fi, Bluetooth;
• auto-switching 2G/3G/4G in "sleep" mode;
• camera test drive;
• change the photo format (the default is JPEG or PNG);
• fine-tuning the display brightness and its response to light;
• lock/unlock auto-answer settings for an incoming call;
• improved GPS performance;
• full “reset”, including factory formatting of the smartphone;
• testing and setting motion sensors;
• display color rendition testing;
• testing and setting up a vibrating alert;
• backing up media files;
• determination of the level of harmful radiation (SAR) on a single device;
• FM radio settings and behavior.

Video: smartphone configuration options through the engineering menu

Menu commands

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

The main codes for entering the engineering menu

The commands to be entered differ for different brands of devices - choose the ones that suit you. It is not forbidden to check everything - commands that do not correspond to a particular manufacturer simply will not work.

Table: commands for accessing the engineering menu of various manufacturers

Commands provided by Google for Android OS

Android factory service codes showing technical information about the device, are often not tied to the manufacturer. Basically, they are all "sewn" into Android by default. The range of "numbering" of commands is agreed by Google - as the creator of the Android operating system - with manufacturers of tablets and smartphones.

Table: Android factory service codes

Parameter opened by code set	Dial code
WiFi MAC address	*#*#232338#*#*
Information about the active WLAN	*#*#232339#*#*
GPS check	*#*#1472365#*#*, *#*#1575#*#*
Bluetooth version	*#*#232331#*#*
Bluetooth MAC address	*#*#232337#*#
Loopback Batch Tests	*#*#0283#*#*
Touch screen version	*#*#2663#*#* (test *#*#2664#*#*)
Motion sensor test	*#*#0588#*#*
Screen check	*#*#0*#*#*
Vibrate and backlight test	*#*#0842#*#*
Melody test	*#*#0673#*#*
RAM version	*#*#3264#*#*

The most popular engineering menu service codes

The most popular codes that allow 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
Find out the IMEI serial number	*#06#
Settings and details	*#*#4636#*#*
Android OS version	*#2222#
Erasing all SMS messages	#*5376#
Smartphone and battery usage statistics	*#*#4636#*#*
Reset your 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, reinstall smartphone firmware. You will not be prompted for confirmation, but you can remove the battery in time - and then restore files and settings from a backup using an application on your computer.	*2767*3855#
Information about the built-in camera and its settings. Firmware update.	*#*#34971539#*#*
Change the mode of operation of the button "Hang up" ("On / Off").	**#*#7594#*#*
Display the file copy screen. Can do backup 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 - as well as save this update to an image in the internal memory and on the SD card. Reflashing the camera once again is not recommended - in case of failure, you will simply ruin it;
• When resetting the Android system and deleting all Google user data, a message will appear on the screen asking you to confirm the reset.

How to enter the engineering menu

To get into 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 particular brand of devices is suitable - with this, the manufacturer protects inexperienced users from actions that are not fully thought out. Some manufacturers, after software debugging a smartphone, completely remove the engineering menu, and all the above commands simply do not work. For example, it does Samsung. Some of the commands you enter can harm both software Android and the device itself.

Often, instead of general service commands, more specific ones work. If, despite all your attempts to “get through” to the engineering menu, none of the service codes work, special applications are needed.

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

How to save settings

In order for the settings made using the Android engineering menu to be saved, you need to exit it correctly. While in any section of the engineering menu, use the on-screen "Back" key either in the menu itself, or press the call cancel button or the "Back" keys under the display - it is indicated as an arrow with a reversal - to go to the engineering menu level higher.

It is not recommended, after setting the value of any setting and confirming it with the Set key, turn off or restart the smartphone by pressing the power button, remove the battery from the device, etc. Exiting the engineering menu may consist of 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 the “raw” firmware. Find out which versions and builds of Android are right for your device. If you have a branded smartphone with an Android version that has pre-installed programs and components from Beeline, MTS, MegaFon or Tele2, feel free to install the "custom" version, for example, the well-known CyanogenMod assembly. Any earlier - or, conversely, the most "fresh" - version of Android may be suitable.

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 most clear and 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 the Superuser software component (“Superuser”), which provides access not only to the engineering menu, but also to the system folder system.
2. Download from the Android Market any of the applications that can hack Android without using a computer. Fit here different programs: Universal AndRoot, Unlock Root, z4root, Revolutionary, etc. Not all of them can help - you have to test everything until it works out.
3. You can also try Windows applications that do all the manipulations with Root access on a smartphone directly from a PC - for example, the VRoot program. You also need a USB-microUSB cable - it's impossible to hack Android on a smartphone over Wi-Fi.

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

The "fresh" version - the more settings in the engineering menu will be in Russian. In the most early versions Android (1.x, 2.x) all service settings were in 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 not decided by the Android version, but by the brand and model of the smartphone. Try different combinations and programs, but don't get too carried away.

With inept actions or forgetfulness of the entered codes, there is a risk of turning the smartphone into a lifeless device, and only in the service center can you restore it. And since in the case of "rooting" the device, you automatically lose the warranty.

The Android engineering menu is one of the most useful tools for an "advanced" user, preventing him from wasting the hardware resource of his device and the resource of the 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 scenario of the manufacturer, 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.