Many smartphone owners Samsung Galaxy A51 face suspicious behavior of the device: rapid battery drain, heating of the case at rest, or strange noises during calls. These symptoms often indicate the presence of hidden software designed to collect data or remotely control the device. The concept of "wiretapping" in the modern context rarely means the classic interception of a radio signal; Most often we are talking about malicious spyware applications installed by attackers physically or through phishing links.
Elimination of such a threat requires an integrated approach, since modern Trojans are able to masquerade as system processes. You need to not only delete the suspicious file, but also block the data transmission channels, and also check the access rights that may have been issued to the fraudulent software. Ignoring the problem can lead to leakage of banking information, personal photos and correspondence. In this article we will analyze a detailed algorithm of actions for clearing your smartphone smartphone from surveillance
Primary diagnosis of abnormal system behavior
The first step is to carefully monitor the operation of the operating system Android. Spyware consumes CPU resources and constantly maintains a connection to the management server, which inevitably affects autonomy. If your Samsung A51 recharges after a few hours without active use or gets very hot in your pocket, this is a warning sign. It is necessary to analyze energy consumption statistics to identify parasitic processes.
Go to the settings and open the device maintenance section. Pay attention to apps that consume battery in the background, even if you haven't used them. Often, malicious code is disguised under names like "System Service", "Update Center" or uses names similar to standard Google utilities. However, unlike legitimate processes, spies can show abnormally high operating time in the background.
It is also worth checking your mobile traffic consumption. Go to menu Settings → Connections → Data Usage. If you see an app that has sent hundreds of megabytes of data even though you haven't used it, this is a clear sign of an information leak. Some advanced Trojans are able to limit data transfer so as not to attract attention, but they rarely succeed in completely hiding network activity.
⚠️ Attention: If you find an application with device administrator rights that you cannot remove in the usual way, do not try to reset the phone right away. First, revoke administrator rights, otherwise the virus may block the reset or recover after it.
Analysis of installed applications and access rights
The second stage of protection consists of manually revising the list of installed software. Attackers often install spyware under the guise of useful utilities: flashlights, memory cleaners, or games. The Samsung A51 interface allows you to study each application in detail. You need to open the list of all apps and sort them by installation date to find suspicious objects that appeared during the period when problems occurred.
Particular attention should be paid to applications without an icon or with a name consisting of a set of characters. Sometimes malicious code is hidden in folders with system names, but upon closer inspection you will notice the absence of a description or developer. A critical parameter is accessibility (Accessibility). Many spyware require this permission to intercept keystrokes and read screen contents.
- 🔍 Check the section
Settings → Accessibilityand disable any services that are unknown to you or are not standard for Samsung. - 🚫 View the list of applications with the right "On top of other windows" in application settings; this permission is often used to create fake password entry windows.
- 📂 Examine your file manager for APK files in the Download or Bluetooth folder that you did not knowingly download.
Don't forget to check the access rights to the microphone and camera. Modern versions One UI have a convenient indicator showing when the microphone is active. If you see a green dot in the corner of your screen when you're not in a conversation or dictating messages, immediately check which app is using the audio input. Revoke all suspicious permissions through the privacy menu.
Checking call and SMS forwarding
The classic wiretapping method is to set up forwarding of incoming calls and messages to the attacker's number. This allows you to intercept your conversations and verification codes from banks without installing complex software on the phone itself. On Samsung A51 this function can be checked and disabled using USSD codes or through the phone settings menu.
Open the "Phone" application and enter the code *#21#. The screen will display the forwarding status for various types of communication: voice calls, data, fax, SMS. If you see the status "Forwarded" and an unknown phone number, it means your calls are going through you. To disable this feature, use the universal reset code ##002#, which cancels all types of conditional and unconditional forwarding.
##002#After entering the code, the system should report successful cancellation of the forwarding. It is also recommended to check the settings in the menu Phone → Settings → Additional services → Call forwarding. Sometimes malware blocks the display of USSD codes, so a visual check in the menu is required. Make sure that the status is “Not forwarded” or “Operator voicemail”.
Periodically enter the code ##002# for prevention, especially after installing new applications from unverified sources or after repairing the phone in dubious services.
Using safe boot mode
If the suspicious application is not removed or is constantly returned, you need to boot your smartphone in safe mode (Safe Mode). In this mode Android it starts only with pre-installed system software, and all third-party applications, including viruses, are blocked. This is an ideal way to diagnose and remove stubborn malware that resists normal removal.
To enter Safe Mode, press and hold the Power button until the shutdown menu appears. Then press and hold the “Power Off” icon on the screen with your finger until “Safe Mode” appears. Confirm the action and the phone will reboot. In the lower left corner of the screen you will see the corresponding inscription. Samsung Galaxy A51 Press and hold the power button until the shutdown menu appears. Then press and hold the “Power Off” icon on the screen with your finger until “Safe Mode” appears. Confirm the action and the phone will reboot. In the lower left corner of the screen you will see the corresponding inscription.
In this state, try going to the application settings again and uninstalling the suspicious software. Since the malicious process is not running, it will not be able to block the delete button. If the app was successfully uninstalled, simply restart your phone as usual to exit Safe Mode. If the problem remains even in this mode, it means that the threat has a deeper level of penetration, possibly at the level of system privileges.
☑️ Actions in Safe Mode
Scanning with built-in and third-party tools
The firmware Samsung has a powerful antivirus engine from McAfee, which often remains unnoticed by users. It's integrated into the Device Maintenance app and can detect known malware signatures. Regular scanning with this tool is a basic measure of hygiene in the digital space of your gadget.
Launch the "Device Maintenance" application, select the "Virus Protection" section and click the "Scan phone" button. The system will check all installed applications and files. If a threat is found, follow the on-screen instructions to neutralize it. However, it is worth remembering that the built-in scanner may not know about the latest or unique developments of hackers.
| Scan type | Tool | Efficiency | Speed |
|---|---|---|---|
| Quick scan | McAfee (built-in) | Average | High |
| Deep analysis | Dr.Web Light / Kaspersky | High | Average |
| Search for Trojans | Malwarebytes | High | Low |
| Network monitoring | NetGuard | Specific | Instant |
For greater reliability, it is recommended to install a specialized antivirus from the store Google Play, for example, Dr.Web or Malwarebytes. These apps use other signature databases and heuristic analysis, which allows them to find threats missed by standard tools. After checking, be sure to uninstall the third-party antivirus if you do not plan to use it constantly, so as not to load the system.
Why don't antiviruses always help?
Modern spies can use code obfuscation techniques or operate as legitimate accessibility services, which makes them invisible to signature analysis. In such cases, only manual analysis of access rights or resetting settings helps.
Radical measures: resetting to factory settings
If none of the above methods helped get rid of surveillance, the only guaranteed way remains is to completely reset the device to factory settings (Factory Reset). This procedure completely erases all data from the phone's internal memory, including the operating system, applications, photos and settings, returning the device to "as-stored" state.
Before performing this operation, it is critical to back up your important data, but do so with caution. Do not save application files or system settings, as you may accidentally save malicious code. Save only personal media files (photos, videos, documents) to your computer or cloud storage, having first checked them for viruses on your PC.
⚠️ Attention: After the reset, the phone will be completely clean. Make sure you remember the password for your Google account, since after switching on you will need authorization to confirm ownership of the device (FRP protection).
To perform a reset to Samsung A51 go to Settings → General settings → Reset → Reset data. Scroll down the list and click the reset button. The device will reboot and begin the cleaning process, which may take a few minutes. Once completed, the phone will prompt you to perform the initial setup.
A full reset is the only way to 100% guarantee to delete any software bookmarks, including those hidden in system memory partitions.
Preventing re-infection
After cleaning your phone, it is important to change your usage habits to prevent re-infection. The main reason for spyware infiltration is the installation of applications from untrusted sources. Never enable the "Unknown sources" option to install APK files downloaded from browsers or received through instant messengers if you are not 100% sure of the source.
Update your operating system and applications regularly. The company Samsung releases security patches that close vulnerabilities used by hackers to remotely install malware. Ignoring updates leaves your Galaxy A51 eve open to attack. It is also recommended to set a complex password or biometric protection to log into the device.
- 🔒 Use two-factor authentication for all important accounts (Google, social networks, banks) so that even if the password is leaked, attackers do not gain access.
- 🚫 Avoid connecting to open Wi-Fi networks without protection, as data can be intercepted through them or viruses can be introduced into the device. local network.
- 👁️ Periodically check the list of active sessions in your Google account and terminate all unfamiliar devices.
⚠️ Attention: The menu interface and item names may vary slightly depending on the One UI and Android update version. If you do not find the specified item, use the search in the settings (magnifying glass icon at the top of the settings screen).
Frequently asked questions (FAQ)
Can wiretapping work when the phone is turned off?
Technically, when the power is completely turned off (not rebooted, namely switched off), the radio modules are de-energized and data transmission is impossible. However, there are sophisticated hardware bookmarks that can simulate turning off the phone, leaving it in standby mode. If the phone heats up in the “off” state or quickly sits down, this is a cause for concern.
A factory reset will remove the virus forever?
In 99% of cases, a full reset to factory settings removes any software, including spyware. The exception is rare cases of bootloader infection or hardware modifications, but for the average user the likelihood of encountering this is extremely low. After resetting, it is important not to restore a backup copy of applications containing a virus.
How to find out who installed the spyware on my Samsung A51?
It is almost impossible to identify the attacker using software methods. You can see the IP addresses of the servers where the data is sent, but they are often encrypted or located in other countries. If there is a suspicion of physical access to the phone (for example, it was given by strangers), you should change all passwords and contact law enforcement agencies.
Will an antivirus help against wiretapping through a microphone?
Modern antiviruses can detect an application that has access to the microphone and is running in the background, but they cannot always determine whether this is a legitimate function (for example, voice recorder) or espionage. The best protection is to manually control permissions in the privacy settings and use the microphone activity indicator.