Service tools become useful in cases where the user needs to access certain functions that are not available in normal mode. By and large, they were invented to test the operation of the device, but we can also use them to call up various menus.

Advanced users deal with them all the time. For example, on some Galaxy devices you can adjust the sound volume, find out hidden information about your phone, and much more. Now we will analyze the most useful service codes that are suitable for users of Samsung smartphones and tablets.

How to enter the service code?

Everything is very simple. Open the dialer and enter numbers with signs that correspond to the menu you want to execute. After entering the last character, the menu should automatically launch; no additional actions need to be performed.

Denial of responsibility: This information is intended for experienced users. You should not try to change anything in the settings if you are not familiar with mobile devices. We are not responsible for any subsequent problems, including loss of data or damage to hardware.

All service codes for Samsung Galaxy smartphones and tablets

I repeat that you should not touch those parameters whose meaning you do not know. You risk losing the functionality of your phone or valuable data.

Useful keyboard shortcuts for Samsung Galaxy

• Enter recovery: with the phone turned off, press the volume up, home and power buttons
• Bootloader/fastboot mode: you also need to turn off the phone, and then hold down the volume down, Home and power buttons
• Take a screenshot: on the desired screen, press the volume up, power and, of course, the Home button.
• Force the phone to switch to off state: simultaneously hold down the volume down and power buttons

We hope these system codes and key combinations will be useful to you, but, as for the 100th time, we want to warn you that you should use them with double caution.

The engineering menu provides access to manual configuration of the “hardware” 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 are worth paying close attention to. If you were unable to enter the engineering menu the first time, then you did not take into account the features of the device. It is worth immediately clarifying that any interference with the operation of the device may lead to its inoperability and loss of warranty.

Hidden capabilities of the system

At the last stages of setting up a smartphone, developers test the system for errors and check the operation of all sensors on the device. Especially for this, Android has a special subroutine built into it - the engineering menu, which provides access to hidden settings of the 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 the 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. Android version does not affect the functionality of the engineering menu.

Enter a special code to enter the engineering menu

If no problems arise, 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 there is a subsection of the menu with elements for testing smartphone sensors, setting up a USB connection, and performing internal and external memory tests.

If it doesn't work out the first time

Not all devices can access the engineering menu. Let's look at a number of common problems and ways to fix them.

Android is difficult operating system Unix based. If you can’t do something, you haven’t taken into account all the nuances of the functioning of a particular subroutine.

List of special codes

One of the common reasons for blocking entry to the engineering menu is an incorrect 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 built into them. The list of combinations is given in the table. If you don't find the one you need, try entering a different combination.

Table: code options for different Android models

DIY engineering menu

If none of the special codes work, don’t worry. There are many applications on the network with engineering menu functionality. It is worth noting that the MTK prefix in the names eloquently indicates compatibility only with MediaTek processors.

The first option is Mobileuncle MTK Tools. In addition to the necessary set of settings, this program has several additional functions: firmware update, recovery update, GPS receiver enhancement mode and much more.

Mobileuncle MTK Tools provides a set of settings

Another program is MTK Engineering Mode. The program completely replicates the standard engineering menu.

MTK Engineering Mode repeats the standard engineering menu

For those whose device is not equipped with an engineering menu, there is another option: installation third party firmware. Assemblies from third-party developers often contain a wide range of customization settings.

Where to begin

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

Engineering menu settings

Settings open up enormous 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. You can enable or disable automatic answering of an incoming call.
2. Band Mode. Allows you to manually select the frequency range for the GSM module to operate. You will see all the technologies and frequencies for them supported by your smartphone model. If you wish, you can uncheck bands 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). The option enables or disables conditional forwarding. It must be supported by the operator.
4. AT Command Tool. A utility for developers that supports AT commands. This menu item will be of interest to programmers and developers. Using this menu, you can perform various queries directly to the system without visual add-ons.
5. Modem Test. Configuring compatibility of the “access point” option with different types connected devices.
6. Network Selecting. Here you can select mobile communication standards (GSM, WCDMA, LTE). For additional energy saving, turn off unused ones.
7. NetworkInfo. Select one or more options to display information about the status of parameters cellular communications. Once selected, open the additional menu (three dots in the upper right corner) and click Check Information. This option is convenient for checking the quality of cellular operator services.
8. GPRS. Setting up a connection to the mobile Internet, selecting an active SIM card (if there are several of them).
9. HSPA Info. Information about the 3G network if supported by your mobile operator.
10. Mobile data service preferred. The Internet will be given priority over voice traffic to increase data transfer speeds. Incoming calls may not go through.
11. Fast Dormancy. Allows you to save battery energy in third generation networks. The option must be supported by your telecom operator.
12. RAT Mode (Phone Info). Allows you to select the priority 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 communication quality.
14. SIM ME Lock. This subsection allows you to configure the regional parameters of the GSM module (MNC, NCC) manually.

Photo gallery: mobile communication parameters

We get to the main window of the subsection Enable or disable auto answer Enable or disable conditional forwarding Configure the “Modem” mode Display information from the GSM module Configure Mobile Internet Select the priority of the connection type Configure the operation of the 3G mode Select the type of mobile connection Check the network power Configure regional communication parameters

Wireless interfaces

This 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, and start the debugging mode.
2. CDS Information. Information about the parameters of wireless interfaces.
3. FM Receiver. Checking the FM module of the device.
4. Wi-Fi. Testing the module for transmitting and receiving information on the specified frequency channel.
5. Wi-Fi CTIA. Recording logs of wireless technology tests.

Photo gallery: wireless data transmission

Select the section for checking the device’s wireless modules Check the bluetooth operating mode Find information about the wireless interfaces Configure the FM module Check the operation of the WiFi module Write data about checking the WiFi module to a log file

1. Audio- fine tuning sound playback settings.
2. Camera - a set of parameters 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 - performing tests of all subsystems central processor.
5. Deep Idle Setting - disable sleep mode in standby mode.
6. Sleep Mode Setting - sleep mode settings.
7. ChargeBattery - View battery information.
8. Sensor - sensor calibration.
9. Multi-Touch - checks the number of available points for simultaneous pressing on the screen.
10. Location Engineer Mode - checking the parameters of the GPS module.

Photo gallery: equipment testing

Go to the verification section electronic components Adjusting the volume conversational speakers Setting up the camera's power supply Setting up the standby mode Setting up the CPU frequency Setting up the sleep mode Looking at battery information Setting up the touch screen Checking the capabilities of the multi-touch function Setting up the GPS module

Adjusting the speaker volume

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

You should be careful when changing volume settings. All parameters are individual for a specific device model. Incorrect configuration may lead to deterioration in hearing performance.

There are a number of general parameters:

1. MaxVol - general volume level. The range of values ​​is from 0 to 160. Than larger number, the higher 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 speaker volume 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 the value above 200, as this may damage the speaker. To make you better heard, change the Mic parameter from 100 to 172. This will increase the sensitivity of the speaker.

ROOT is a panacea for a smartphone

On a smartphone without root rights functionality The engineering menu is limited: some items are not displayed, changes made are not saved. For any intervention in the operation of the smartphone, you need open access into the system. Don't forget that gaining root access can damage your gadget and will void the device's warranty. We strongly recommend doing backup important information to a memory card and synchronize with your 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. Let's look at the sequence of operations using the KingRoot program as an example:

After this, you can safely change the parameters in the engineering menu, all changes will be saved. If the result is negative, we 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 operation of the hardware. This is a built-in system routine that is an indispensable tool for both experienced users and newcomers to the world of mobile devices. However, it should be noted that manipulations with the engineering menu can render the gadget inoperative.

Welcome to our beloved visitors. Today we will advise you on the engineering menu of the Galaxy S8. Why is it needed, and what is its usefulness and relevance? The purpose of this menu is to check all the functionality of the smartphone. Yes, with its help we can check all the chips of the phablet for functionality.

The apogee of the relevance of using it occurs when checking a phone before purchasing it based on an ad on the Internet, by hand, etc. This method helps to dispel his accompanying sales phrases such as, yes, the work phone is a friend, everything is as it should be, I swear by my mother, etc.

Note!
Visiting and using the engineering menu should be done with a clearly defined goal, and not out of curiosity. If you do not know the purpose of a particular button, it is better not to press it. So as not to give yourself a headache. If you really want to, ask about it in the comments, we’ll tell you what and how :)

No need to press call

To get to the engineering menu of your galaxy, you need to enter a certain combination of numbers and symbols in dialing mode. There is nothing special about this entrance, everything is the same as with all other androids.

We go into dialing mode.

On the keyboard we type the following: *#0*# eureka, we are in the service menu!

On a note!

Would you like to know all the service commands? List of all codes on Galaxy S8!

If after typing this combination nothing happened, we recommend rebooting the phablet and re-entering the characters.

Features of the engineering menu on the Galaxy S8

We are presented with the full range of functionality of the phablet

Actually, what is the point, and the purpose of the service menu. With its help, we check the functionality and quality of the technological state of both functions and individual mechanisms of the Galaxy S8. Below we present a list of the main functions:

• The color gamut of the screen is dead pixels.
• Vibration mode.
• Call functionality.
• Camera lens.
• Touch response.
• Microphone.
• Camera flash.
• LTE modem.

And we will not limit ourselves to this list when checking it. Explaining in simple words, this procedure allows you to check the functionality of its functionality.

In conclusion, all that remains is to add simple recommendations; purchase this flagship in the official store. So that you don’t have to go so far and deep to check your phone :)

We wish everyone good luck in using the Galaxy S8 service menu, and look forward to your questions in the comments!

Video: How to enter and use the Samsung test menu

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) is essentially a hidden application that developers use to test and set 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.

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 you cannot launch the service menu using the standard method, use third-party applications - you can download them on PlayMarket. Recommended programs - “Launch the MTK engineering 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.

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 a list of secret commands operating 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.

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 the program. Link in Google Play: //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.

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

The appearance of the engineering mode and the ability to adjust parameters 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 - the names of menu items may differ in different device models! You act at your own risk.

Audio: Increase volume level

If your phone does not ring loudly enough, find the Audio section in the engineering menu 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.

Audio: Increase phone call volume

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

To increase the sensitivity of the microphone, go to the menu Audio - Normal mode - Mic. For each level, assign the same microphone sensitivity values, for example, 200. Press the SET button, reboot and check whether the other party can 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 900/1800 MHz pair, 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 by 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.

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

• resetting settings to standard;
• firmware update;
• access to root rights;
• Creation backup 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 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.

Service codes for Android devices

In addition to the technical menu, you can control the functionality of Android smartphones secret USSD codes- 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#*#*	Vibration 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 the service code did not work, do not worry - install and run the Secret Codes application (Google Play link: //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. Many devices running the Android OS are additionally equipped with a special environment - the engineering menu. With its help, the user has the opportunity to test all the sensors and modules of the mobile device, as well as adjust certain parameters of the gadget for more comfortable use. In Samsung phones, Engineering Mode is hidden in the system by default. And in different models logging into it is done differently. And the functionality of this area may also differ. Let's look at how to enter the engineering menu on Samsung Galaxy

A5, Galaxy S6, J3 and other smartphones from the Galaxy line.

Where to find the engineering menu on Samsung Galaxy The main purpose of Engineering Mode is to mobile devices at the final stage of their production. This environment was originally developed for debuggers on smartphones and tablets, but today anyone can use it. The main thing is to know how to open technical mode on Galax.

You can enter the engineering menu using a special combination (USSD code), which is written in the dial panel. However, these commands may differ in different phone models:

• in Samsung J7 and J1 the actual combination is *#*#0011#;
• for Samsung Galaxy A5, Galaxy S5, Galaxy S6, the dial *#*#8255#*#* or *#*#197328640#*#* is suitable;
• on Samsung Galaxy A3 the code is *#*#9646633#*#*;
• for Samsung Galaxy S3 – *#*#0#*#*;
• in Samsung Galaxy S7 Edge – *#*#8255#*#* or *#*#4636#*#*.

On other devices from the Galaxy line, you can use the service combinations *#*#4636#*#*, *#*#8255#*#* or *#*#3646633#*#*.

If you can’t open the engineering menu using the above commands, you can resort to one of the programs developed specifically for this purpose (EngineerMode, Mobileuncle Tools, Shortcut Master, etc.). To start the technical mode, just install and run one of the utilities. After this, you will automatically enter Engineering Mode.

All applications for opening the engineering menu only work with MTK processors(MT6573, MT6577, MT6589, etc.) and with some Exyon chips. For phones equipped with a Qualcomm CPU (for example, Samsung Galaxy A5), such software will be useless.

Main features of the engineering menu on Samsung Galaxy

Having figured out how to enter the engineering menu on Samsung, let's look at its main features. A full-fledged Engineering Mode for MTK chips is equipped with a large number of tools with which you can perform a complete diagnosis and fine-tune the Samsung in many parameters.

However, many smartphones have a stripped-down version of the technical mode, which somewhat reduces its functionality. And in mobile devices based on a Qualcomm processor, through the engineering menu you can only view information about some modules and perform small tests of the main elements of the phone (display, modem, SIM cards and battery).

On the Samsung Galaxy A5 and Galaxy S6, the main sections of the engineering menu are:

1. Telephony;
2. Wireless interfaces (Connectivity);
3. Testing mode (Hardware Testing).

In the Telephony tab, the user has the opportunity to:

The Connectivity section is intended for diagnosing and configuring Wi-Fi, Bluetooth and FM wireless modules. It is not recommended to change anything here, as this may lead to failure of the smartphone.

The most popular tab in the engineering menu is Hardware Testing. This is where you can test the performance of the processor, battery, speakers, camera, display and GPS module. This area allows you to perform a complete diagnosis of Samsung during its purchase and identify possible malfunctions of the product.