Smartphones based on Android hide much more capabilities than it seems at first glance. Hidden behind the standard interface that we are accustomed to are special utility utilities, which can be accessed using unique character combinations. These tools allow you to carry out deep hardware diagnostics, check the authenticity of the device, or even reset complex network settings without entering the menu.

Most users do not even suspect that they do not need to install third-party applications to obtain information about the screen operating time or radio module version. It is enough to know the correct algorithm of actions. In this article, we will look in detail at how to correctly enter such commands, what restrictions exist, and how not to harm the system when trying to access hidden functions.

It is important to understand that not all codes are universal. What works on Samsung Galaxymay be useless on Xiaomi or Google Pixel. Manufacturers often modify the system core, blocking access to certain engineering menus or replacing standard commands with their own analogues.

The technical essence of USSD requests and engineering menus

When you type a combination of characters in the dialer, the system interprets it in two ways. The first option is to send USSD request to a telecom operator. These commands usually start with an asterisk and end with a hash. They are processed on the cell tower side and return a response in the form of a text message directly to the screen.

The second option is a local command for the device itself. In this case, the signal does not go anywhere, and the operating system Android instantly responds to the input, opening a hidden window or performing an action. It is these local codes that are of the greatest interest to advanced users and service center technicians.

The engineering menu, which is often called Service Mode, provides access to parameters that are normally hidden from the user’s eyes. Here you can see the real processor temperature, signal level in dBm, information about the modem firmware and much more. However, accessing this data requires caution.

⚠️ Attention: Making changes in the engineering menu without understanding the purpose of the parameters can lead to unstable communication or complete failure of the phone modules. Use the mode only to view information.

There is also the concept of Factory Reset codes that initiate a complete reset of the device. They are activated instantly after dialing the last digit or pressing the call button, without additional confirmation in some older versions of the OS. This makes them potentially dangerous if handled carelessly.

Why do some codes not work?

Smartphone manufacturers often block access to standard engineering codes (for example, ##4636##) in their shells. On Xiaomi, Huawei or Honor devices, these combinations can be disabled at the firmware level. In such cases, you have to use special launcher applications or get root access to emulate input.

Algorithm for entering commands on various devices

The process of entering secret codes on Android is as simple as possible and does not require special skills, but has its own nuances depending on the device model. The standard procedure looks the same for most gadgets, but the dialer interface may differ.

First, you need to open the standard application Phonethat is used to make calls. Do not try to enter combinations in the search bar of your browser or in instant messengers - the system will not recognize them as commands. Only the dialing field can correctly process special characters.

Dial the sequence of characters slowly and carefully. Most codes work automatically immediately after entering the last character (usually a hash #). You do not need to press the green call button unless the specific code instructions indicate otherwise. The screen should instantly switch to the service menu.

  • 📱 Open the Phone application and go to the dialing tab.
  • 🔢 Enter a combination, for example *#06#, using the on-screen keyboard.
  • ⚡ Wait for it to automatically trigger commands or press the call button (for USSD).
  • 👀 Examine the window that appears with technical information.

It is worth noting that on devices with large screens, the keyboard may be moved down, which sometimes leads to accidental presses. If the code does not work, try deleting everything and entering it again, making sure that you do not confuse the asterisk * with other characters.

💡

If the code does not work automatically, try pressing the green handset button after entering the entire combination. Some telecom operators require explicit confirmation of sending a USSD request.

Smartphone owners Samsung may encounter a situation where the code is entered, but nothing happens. In this case, it is worth checking whether the “Emergency calls only” mode is activated, which blocks the entry of unnecessary characters. Also, the problem may lie in a missing SIM card, since some checks are tied to the network status.

⚠️ Attention: On smartphones with two SIM cards, some engineering menus can display data only for the card that is selected as the main one for data transfer at the moment.

There is a set of commands that work on the vast majority of devices running Android, regardless of the brand. These codes are considered the “gold standard” for quickly checking the condition of a gadget before purchasing or after being dropped.

The most famous code is *#06#. It displays the device's unique ID IMEI. This information is critical when checking a phone for theft or when registering a device with an operator. By checking the number on the screen with the number on the box and under the battery, you can verify the originality of the device.

Another useful request is ##4636##. It opens the testing menu where you can view battery usage statistics, Wi-Fi connection information and detailed phone statistics. This displays the network type, signal strength and tower connection status.

📊 Which code do you use most often?
#06# (IMEI)
##4636## (Test)
#0*# (Screen)
Never used

To check quality The display code is often used #0#, which is especially popular on devices Samsung. It starts the screen test mode, allowing you to check the operation of the touch layer, the presence of dead pixels and the correct display of colors. This is an indispensable tool when buying a used smartphone.

Below is a table with the most popular commands and their purpose. Remember that functionality may vary depending on the version Android and the manufacturer's shell.

Command Purpose Compatibility
*#06# Display IMEI and serial number All devices
##4636## Test menu (battery, network, statistics) Pure Android, Motorola
#0# General service menu (screen test, sensors) Mainly Samsung
##34971539## Information about the camera and driver version Devices with Qualcomm chips
##7780## Reset application settings (without deleting files) Most devices

Using these commands allows you to quickly identify hidden defects. For example, if the application crashes or shows an error when entering the camera verification code, this is a sure sign of problems with the drivers or the physical module of the camera.

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The code *#06# is the safest and most universal way to verify the authenticity of a smartphone, since it only displays information and does not change anything in the system.

Major smartphone manufacturers often implement their own extensions into the standard command set Android. These codes allow you to access functions that are not provided in the “clean” version of the operating system.

Devices from the company Xiaomi (including brands Redmi i Poco) have their own unique engineering menu called by the code ##6484## or ##4636## (on some firmware). Here you can test vibration, the operation of the volume buttons, accelerometer and even the compass. This is a full-fledged diagnostic center.

Smartphones Huawei and Honor use a code ##2846579## to enter the ProjectMenu. It allows you to configure the USB configuration, restore the factory network settings, or view the system error log. However, access to it on new models may be limited by a security update.

  • 🔧 Sony Xperia: code ##7378423## opens the service menu for GSM and sensor tests.
  • 🛠 LG: combination 3845#*model# (where model is the phone model numbers) gives access to hidden settings.
  • 📡 Motorola: support many standard codes, but also have specific ones for checking CDMA networks.

Owners iPhone should know that the ecosystem iOS works differently, and codes from Android doesn't work there. However, in the context of our article, we focus specifically on the platform Google, where the variety of commands is much wider due to the openness of the architecture.

⚠️ Attention: On devices Huawei with new versions of EMUI, entering the engineering menu through code may be blocked. In this case, you will need to obtain special rights or use a PC with USB debugging.

If you do not find your brand in the list, try looking for documentation for a specific model on the developer forum XDA. Enthusiasts often compile complete lists of working commands for rare or new models that have not yet been included in general knowledge bases.

☑️ Checking a used smartphone before buying

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Security measures and possible risks

Despite the usefulness of secret codes, their uncontrolled use carries certain risks. Some commands are intended for factory-level engineers and can change the configuration of the radio module or erase important sections of memory.

Format-related codes are especially dangerous. For example, the combination *2767*3855# on some older models Samsung performed a complete reset of the phone without confirmation, deleting all data, including photos and contacts. The function is usually password protected or removed, but the risk remains.

There is also a danger of the device being “bricked” when changing parameters in the menu Radio InformationIf you accidentally switch the preferred network type to an incompatible standard or change the frequencies, the phone may lose the ability to register with the operator's network.

Always remember that you act at your own risk. and risk. Before entering any menus marked as Engineering or Service, make sure that you have a backup copy of important data. In the event of a system failure, it will be impossible to restore information without a backup.

In addition, some malicious sites may distribute false codes claiming that they “speed up the phone” or “hack Wi-Fi.” The reality is that such combinations either do not work or are destructive. Trust only trusted sources of information.

What to do if the phone stops receiving the network after entering the code?

If the network has disappeared after manipulations in the engineering menu, try resetting the network settings through the standard Android menu. If this does not help, you may need to flash it. devices with full partition formatting.

Frequently asked questions (FAQ)

Why does the code ##4636## not work on my phone?

Many manufacturers (Xiaomi, Huawei, OnePlus) block this standard code in their shells. Try using alternative ones. combinations for your brand or install an application Hidden Settings from the Play Market store that emulates this request.

Is it possible to enter a secret code if the phone does not have a SIM card?

Yes, most local commands (engineering menus, IMEI check, screen tests) work without a SIM card, since they are processed by the phone's processor. However, USSD requests that require communication with the operator (checking balance, tariff) will not work without a SIM card.

Is it dangerous to enter the IMEI verification code?

No, the code *#06# is absolutely safe. It only reads information from a protected memory area. displays it on the screen. This command does not make any changes to the system and cannot damage the device.

How can I find out if my phone supports a specific secret code?

The only way is to try entering it in the Phone application. If the code is supported, the menu will open automatically. If not, you will see the dialed numbers in the dialing line, and nothing will happen after entering the last character.

Is it possible to unlock a phone from an operator using codes?

In modern realities - practically not. Previously, there were codes for entering an unlock code (NCK), but now this procedure is carried out remotely by the operator or through special paid services. Secret codes in the menu do not provide free unlocking functions.