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, entering it is performed differently. And the functionality of this area may also differ. Let's look at how to enter the engineering menu on the 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 fully test 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 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:
- Telephony;
- Wireless interfaces (Connectivity);
- 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. 
How to go to the engineering menu for the Galaxy S5. Secret codes.
The engineering menu of a smartphone is a special section that makes it possible to expand or adjust settings and any specified parameters in the device system.
If the user needs to go there on his Samsung smartphone, he needs to follow simple steps. To eliminate various defects in the operation of your devices, you can contact the Samsung service center; addresses in Moscow and other cities of Russia can be found by going to the official website using the link.
How to enter the engineering menu on Samsung
In order to enter the engineering menu of a Samsung Galaxy, Galaxy Note, Neo, Duos phone, you should enter a certain command:
For earlier models it is *#*#8255#*#* or *#*#4636#*#*.
After you enter this command, the combination of symbols will immediately disappear, and the engineering menu of your phone will open in front of you.
Here are some more service codes:
*#06# find out IMEI
*#1234# firmware version
*#0228# information about energy intensity
*#0808# USB setup
#0011# or #0909# Service mode
*#0283# loopback testing
*#9900# dump mode
Please note that on some devices you must also press the call key to perform this operation. If you encounter any difficulties, contact a Samsung smartphone repair service center.
You need to understand that this method may not work on every phone. The fact is that different smartphone models run on different versions of the Android platform, depending on the year of manufacture and manufacturer. From here there are different ways to enter the engineering menu.
If none of the above combinations of numbers helped you access this section of your phone, then you need to take an alternative route - using a special application for this.
You need to download and install the Mobileuncle MTK Tools 2.4.0 program on your phone. on Google Play. With this program, you can quickly and seamlessly access advanced features on your phone.
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.
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 the optimal parameters of a 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 the Cyanogen Mod firmware is installed. 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: creating, searching, deleting. It does not have a direct function for entering the engineering menu. But with its help you can view the 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:
- Install and run the program. Link to Google Play: //play.google.com/store/apps/details?id=com.farmaapps.filemanager&hl=ru.
- If the application supports installing root rights on your device, then on the screen you will see a list of possible actions, among them - “Get root”. Select this item.
- Choose one of the preset root methods.
- The program will begin installation.
- At the end of the procedure, you will see a message about the successful installation of root 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 drain 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 is an analogue of Bios on a computer, it allows you to manage the device without logging into the 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.
Service codes for Android devices
In addition to the technical menu, secret USSD codes - combinations of numbers and symbols, which the user types by typing to perform an action, allow you to control the functionality of Android smartphones. 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.
