Checking a Samsung phone for wiretapping: USSD codes and protection methods

Suspicions that your smartphone has turned into a “bug” often arise for no apparent reason, but ignoring them is dangerous, especially if you use the device for confidential conversations. Device owners Samsung are in a special position, since this brand has its own specific security protocols and engineering menus, different from pure ones. Many users are looking for universal combinations of numbers, hoping to find out the truth with one click, but the reality is more complex and requires an integrated approach to diagnosis. Android. Many users are looking for universal combinations of numbers, hoping to find out the truth with one click, but the reality is more complex and requires an integrated approach to diagnosis.

There is a common misconception that special ones can instantly identify hidden spyware. In fact, these combinations are primarily designed to test network settings and call forwarding, which attackers often use to intercept incoming calls. If someone has set up your calls to be forwarded to their number, you may not notice it until you check the status through the system menu or a special request. USSD codes capable of instantly revealing hidden spyware. In fact, these combinations are primarily designed to test network settings and call forwarding, which attackers often use to intercept incoming calls. If someone has set up your calls to be forwarded to their number, you may not notice until you check the status through the system menu or a special request.

In this article we will look in detail at exactly how to check your Samsung for signs of interference, using both built-in functions and third-party analysis methods. You will learn which combinations really work on modern versions One UIand which are myths, and also learn to distinguish the legitimate activity of a telecom operator from the actions of malware.

Myths and reality of using USSD codes on Samsung

The Internet is replete with lists of “secret codes” that supposedly disable wiretapping or show a list of all connected devices. It is important to understand that most of these combinations, such as *#21# or ##002#, relate to standard GSM network functions, and not to deep diagnostics of the operating system. On smartphones Samsung some codes may be blocked by the telecom operator or require superuser rights that are not available to the normal owner.

However, checking the forwarding status is the first and mandatory step in diagnosis. If an attacker has installed spyware, he will often activate the “Forward when unavailable” or “When busy” function so as not to miss an important call while you are talking with another subscriber. Entering the code *#62# allows you to see the number to which calls are forwarded when your phone is turned off or out of network coverage.

It is worth noting that the presence of a number in the forwarding field does not always mean hacking. It will often list your carrier's voicemail number, which is a standard setting. However, if you see an unfamiliar landline or mobile number that you did not set up, this is a red flag. In this case, you must immediately reset your forwarding settings.

⚠️ Attention: Do not try to enter chaotic combinations of characters in the hope of finding a hidden menu. Some engineering codes on Samsung can lead to resetting network settings or changing the IMEI configuration, which will require a visit to the service center for restoration.

To completely clear all types of forwarding (voice, data, fax, SMS), it is recommended to use a universal reset code. It sends a request to the telecom operator to delete all conditional and unconditional call forwards associated with your SIM card.

##002#

After entering this combination and pressing the call button, you should receive a message indicating that the settings were successfully deleted. This action is harmless to the data on the phone, but ensures that your calls do not go to third-party numbers.

Analysis of traffic and battery consumption as an indicator of espionage

Modern spyware (stalkers) work in the background, constantly transmitting recorded conversations, geolocation and screenshots to the attacker’s remote server. This activity inevitably takes a toll on device resources. If your Samsung started to discharge much faster than usual or heat up in standby mode, this may be a direct consequence of malware.

The operating system Android, especially in the shell One UI, implements detailed monitoring of energy consumption. Attackers often disguise their applications as system processes with nondescript names such as “System Update,” “Wi-Fi Service,” or “Android Core.” However, even under the guise of a system process, such an application will consume an abnormally large amount of energy.

To carry out diagnostics, you need to go to the settings and carefully study the statistics. Pay attention to apps that use your battery in the background, even if you haven't used them during the day. Also check your mobile data consumption: transferring audio and video data requires a significant amount of traffic.

• 🔋 Go to Settings → Device maintenance → Battery and look through the list of applications from top to bottom.
• 📡 Open Settings → Connections → Data usage and check for unknown apps consuming gigabytes of traffic.
• 👁️ Pay attention to applications with the “Work in the background” permission that you did not install deliberately.

If you find an application with high resource consumption that is unfamiliar to you, do not rush to delete it immediately. First, try to find information about it on the Internet by its exact name. Sometimes this is the name given to legitimate system services Samsungnecessary for functions like Bixby or SmartThings.

Checking device administrator rights and available applications

One ​​of the most dangerous vulnerabilities is when a malicious application gains rights device administrator. If such a app gains these rights, it can prevent itself from being uninstalled, block factory resets, and take over escaping control. On smartphones Samsung this settings section is located in the standard security menu, but users rarely look there.

Attackers often use social engineering to convince the victim to give up these rights. For example, spyware may be hiding under the guise of an “antivirus” or “memory optimizer.” Once you click "Activate" when prompted for admin rights, the app gains near-total control over your phone.

Checking your list of admins regularly is a critical security procedure. This list should contain only trusted services, such as “Find my device” from Google or Samsung, as well as corporate profiles if the phone is issued by the employer. The presence of any other application in this list is a cause for immediate alarm.

To check, follow these steps:

1. Open Settings and find the section Biometrics and security (or simply Security).
2. Select item Other security settings or Device administrator applications.
3. Carefully study the list: if you see an unknown application with a check mark, immediately uncheck it it and remove the app.

Sometimes malware disguises itself so cleverly that it hides its icon from the general list of applications, leaving traces only in the administrator settings. Therefore, a visual inspection of the desktop does not guarantee the cleanliness of the system.

⚠️ Attention: If the “Deactivate” button for a suspicious application is not pressed or the menu closes quickly, it is possible that the virus has already blocked the ability to change settings. In this case, you will need to boot in safe mode.

Diagnostics through the engineering menu and Samsung test mode

Devices Samsung have a powerful built-in diagnostic tool accessible through a special menu. Unlike regular USSD codes, this menu provides access to hardware tests, network status and information about the phone. It is entered through a code #0#that works on most Galaxy models without the need for root access.

Although this menu does not directly show “who is listening”, it helps to identify. anomalies in the operation of communication modules. For example, test Sensor can show the activity of proximity or light sensors when the phone is lying on the table. The activity of the sensors in the absence of external influences may indicate that some application is trying to use them to record or activate the device.

You can also check the status of the SIM card and signal strength in the engineering menu. Sharp signal jumps or frequent switching between communication standards (3G/4G/5G) without moving the subscriber may indicate an attempt to intercept traffic or the operation of an IMSI interceptor (“stationary bug”). However, to confirm this theory, more complex analysis tools are needed.

It is important to distinguish between the user’s engineering menu and the service menu, which is available only to authorized centers. Attempts to enter service menu codes (for example, *#9900# for logs) without understanding their purpose may lead to changes in the radio module settings, which will worsen the quality of communication.

Access code	Purpose of function	Safety of use
#0#	General testing of equipment (screen, sensor, sound)	Safe, does not change settings
*#06#	Display IMEI and serial number	Absolutely safe
*#9900#	System dump and logs (SysDump)	Requires caution, may reset logs
*#2263#	Configuring frequency ranges (Band Selection)	Dangerous, may disrupt network operation

Use code #0# for a basic check of the health of the microphone and speaker. If in a microphone test you see sound wave activity without your participation, this may be a sign of remote recording activation.

What to do if the tests show failures?

If the built-in tests Samsung detect errors in the operation of communication modules or sensors, this does not always mean a virus. There may be a hardware problem. Try resetting your network settings before contacting the service.

Searching for hidden applications and analyzing installed packages

The most primitive, but often effective method of detecting a spy is a thorough review of the list of all installed applications. Malicious apps on Android often try to hide their icon by assigning themselves an empty name or a system process icon. On smartphones Samsung with a shell One UI such applications may not be displayed on the desktop, but are sure to be present in the general list.

Go to Settings → Applications and scroll the list to the very end. Look for applications without icons (gray square) or with names consisting of one character, a space, or a series of random letters. Also pay attention to duplicate system applications, for example, two “Calculators” or two “File Managers”.

Particular attention should be paid to applications with rights to access accessibility features (Accessibility). Spyware often requests these rights to intercept keystrokes (keylogging) and read screen contents. If you see an unknown application in the Accessibility list, this is an almost guaranteed sign of infection.

For a more in-depth analysis, you can use Developer Mode. By enabling it, you will have access to a list of running services, where you can see the processes consuming memory right now. This helps identify “invisible” apps that do not appear in the regular task manager.

Algorithm of actions when a suspicious package is detected:

• 🛑 Click on the application in the list and select “Disable” if the “Uninstall” button is inactive.
• 🔍 Check the section "Accessibility" and revoke permissions from all suspicious apps.
• 🗑️ After revoking administrator rights and accessibility features, try uninstalling the application completely.

⚠️ Attention: Some modern Trojans have a self-defense function. When you try to remove them, they may lock the screen or reboot your phone. In such cases, deletion is possible only through safe mode or a computer with installed ADB.

Radical measures: Reset and protection against re-infection

If you find obvious signs of wiretapping, but cannot remove the malicious application using conventional methods, the only reliable solution is to completely reset the device to factory settings (Factory Reset). This procedure removes all user data, applications and settings, returning the phone to “out of the box” condition, which ensures the removal of any spyware.

Before performing a reset, it is critical to save important data (photos, contacts, documents) to external storage or cloud storage. However, do not restore applications from a backup automatically, as you may accidentally return an infected file. It is better to reinstall the applications from the official store Google Play or Galaxy Store.

After resetting, you must immediately change all the passwords that you entered on the phone: from account Google and Samsung to banking applications and social networks. The attacker could have saved this data in his logs before you cleaned the phone.

To prevent re-infection, follow the rules of digital hygiene:

1. Do not install applications from unknown sources (APK files from instant messengers or websites).
2. Update your software regularly Samsungas updates contain patches for security vulnerabilities.
3. Use two-factor authentication for all important services.
4. Periodically check the list of active sessions in your account Google and terminate unfamiliar devices.

Remember that software protection is powerless against hardware “bugs” physically built into the phone. If suspicions remain even after a full reset and a clean system installation, the problem may be hardware in nature and will require examination by a specialized laboratory.

Frequently Asked Questions (FAQ)

Can a telecom operator listen to my conversations without my knowledge?

Carriers technically have access to traffic, but listening to conversations without court approval is illegal. Typically, operators provide only metadata (who called, to whom and when). Encryption of modern protocols (VoLTE, instant messengers) makes it difficult to eavesdrop on content even for the provider.

Does airplane mode help protect against wiretapping?

Enabling airplane mode disables all communication modules (GSM, Wi-Fi, Bluetooth), which actually stops data transmission to the attacker's server. However, this is only a temporary measure: as soon as you disable the mode, the connection will be restored and the spyware will continue to work unless it is removed.

How do I know if my Samsung has a parental control app installed that I did not install?

Parental control apps often require administrator rights and special features. Check the Device Administrators and Accessibility sections in Security Settings. If there are apps like Life360, Kaspersky Safe Kids or other trackers that you did not install, the phone is controlled.

Is it possible to remove a virus from a Samsung phone via a computer?

Yes, using the utility Samsung Smart Switch on a PC you can reinstall the firmware, which will clear phone. You can also use commands ADB (Android Debug Bridge) to force the removal of packages that are not removed through the phone interface, but this requires command line skills.

Does a low battery affect the accuracy of the wiretapping check?

No, the battery level does not affect the presence of spyware. However, rapid discharge is one of the indirect signs of malware activity. If the phone is discharged within a couple of hours in standby mode, this is a reason for deep diagnostics, regardless of whether they are listening to you or not.