Modern smartphones store more personal information than the secret folders of the intelligence services of the past. For device owners Samsung the issue of digital hygiene is becoming critically important, especially given the popularity of the brand among corporate users. Suspicions that someone is reading your messages or listening to conversations often do not arise out of nowhere: strange behavior of the interface or rapid battery drain may be the first warning signs.
In this article we will analyze in detail, how to check if there is wiretapping on an Android Samsung phoneusing built-in system tools and third-party utilities. We will not rely on myths and urban legends, but will focus on real technical signs of the presence of spyware (spyware). Understanding the Android architecture will help you conduct a security audit yourself without resorting to the services of expensive service centers.
You should start checking by analyzing the behavior of the device in a calm state. If your Samsung Galaxy suddenly began to behave differently, this is a cause for concern. However, panic is a bad advisor, so we will follow a clear algorithm of actions that will identify the threat or dispel doubts.
Primary signs of infection and abnormal system behavior
Before delving into the technical settings, it is necessary to assess the general condition of the gadget. Spyware, unlike regular viruses, tries to remain invisible, but their work requires resources. Case overheating in standby mode is one of the most obvious symptoms. If the phone is hot when lying on the table and not in use, it means that some process is actively running in the background.
Pay attention to the activity indicators. Modern versions of the shell One UI implement a system of notifications about access to the microphone and camera. If you see a green dot in the corner of the screen when you are not making calls or taking photos, this is an alarming signal. Constant microphone activity in the background is the main sign of wiretapping.
⚠️ Attention: Rapid battery drain does not always mean a virus. A worn-out battery or poor cell tower signal produces similar symptoms. Rule out these factors before making a diagnosis.
It is also worth listening to the quality of the connection. Extraneous noises, clicks, echoes, or delays at the start of a conversation may indicate interference with the audio channel. Although such interference is less common in the VoLTE era, its presence in combination with other symptoms requires immediate attention. Record several conversations in different locations to cut off the influence of a bad network.
Diagnostics through engineering codes and statistics menu
The Android operating system provides hidden menus for developers and engineers that can shed light on call forwarding. This is a classic method to find out where your calls are going. Open the Phone application and enter the combination *#21#. The screen will display the forwarding status for voice, data, and faxes.
If the fields display a phone number other than yours, or the status is "On" without your approval, then calls are being forwarded to third parties. To reset all forwarding settings, use code ##002#. This command is universal for most operators and devices Samsung, it forcibly disables all types of conditional and unconditional forwarding.
Use the code ##002# regularly if you suspect that someone has physical access to your unlocked phone to set up forwarding.
Another useful code — ##4636##. It opens the testing menu where you can view the phone's usage statistics. The time the device was last used is displayed here. If you just turned on the screen, and the “Use time” column shows several hours of activity, it means that the phone was used in the background. This could be synchronization, updating, or the operation of a malicious script.
What to do if the code does not work?
Some telecom operators block the execution of USSD commands at the network level, or the manufacturer may have changed the code for a specific Samsung model. In this case, use the settings in the “Phone” -> “Advanced” -> “Call Forwarding” menu.
Do not forget that experienced attackers can use more complex schemes that do not affect standard forwarding. Therefore, code verification is only the first stage, and not a guarantee of complete security. Combine this method with analysis of traffic and installed applications.
Audit of installed applications and access rights
The most common way to implement wiretapping is to install a special application under the guise of a useful utility. Attackers often disguise spyware as “System Service”, “Android Update” or “Wi-Fi Helper” icons. Go to Settings → Applications and carefully study the full list.
Sort applications by installation date. If you see a app that you did not install yourself, or an application without an icon or name (an empty line in the list), it is almost certainly malware. Click on the suspicious item and check its permissions. The spy requires permissions to access to the microphone, contacts, SMS and location.
☑️ Checking suspicious applications
Pay special attention to applications with device administrator rights. Go to Settings → Biometrics and security → Other security settings → Device administrator applications. There shouldn't be anything superfluous here. Typically, only Google's Find My Device or enterprise customers have rights. If you see an unknown name here, immediately revoke the rights and uninstall the app.
⚠️ Warning: Some Trojans block the “Delete” button. If the system does not allow you to uninstall the application, try booting into Safe Mode (hold the shutdown button, then press and hold the "Shutdown" icon on the screen).
In Safe Mode, only system applications are loaded, which allows you to remove malicious software that usually blocks this operation. After cleaning, reboot your phone normally. Regular audit of the list of apps is the best prevention of data leakage.
Analysis of traffic consumption and background activity
Transferring stolen data (audio recordings, screenshots, correspondence) requires an Internet connection. The spy application must regularly send packets of information to a remote server. You can check this through traffic statistics. Open Settings → Connections → Data usage → Mobile data.
View the list of applications, sorting them by the amount of data transferred. If a simple utility, such as Flashlight or Calculator, uses up hundreds of megabytes, this is a clear sign of an anomaly. Legitimate system processes usually consume minimal traffic in the background unless there is a firmware update.
| Application type | Normal consumption | Suspicious consumption | Action |
|---|---|---|---|
| Messengers | High (when active) | High in the background 24/7 | Check synchronization settings |
| System services | Low / Moderate | Sharp surges in traffic | Log analysis, resetting network settings |
| Simple utilities | None / Minimal | Any activity in the background | Immediate removal |
| Games | Only at startup | Data transfer when turned off | Check for Trojans |
Also check battery usage statistics. Go to Settings → Device maintenance → Battery. Applications that heavily use the microphone or GPS will consume a significant amount of power. If you see a app at the top of the list that you have hardly used, this is a reason for a detailed check.
For a deeper analysis, you can use the built-in network monitoring. In some models Samsung the “Traffic Monitoring” function is available in the connection settings. It allows you to see which applications are accessing the network in real time. Bursts of activity at 3 a.m. when the phone is sleeping are a sure sign of a botnet or spy.
Use of antiviruses and security scanners
Built-in defender McAfee in Samsung smartphones is a good tool for basic checking, but it can miss complex targeted attacks. For in-depth analysis, it is recommended to install a specialized scanner. The market leaders are considered to be solutions from Kaspersky, ESET and Dr.Web.
Run a full system scan. Modern antiviruses can detect not only known virus signatures, but also suspicious behavior (heuristic analysis). Pay attention to notices about “Risk Apps” or “Unwanted Software.” Spyware is often classified as Riskware, and not as direct viruses.
Antivirus is the last line of defense. If it doesn’t find anything, but there are symptoms, the problem may be at the firmware or hardware level.
It is important to download antiviruses only from the official store Google Play. Installing security software from third-party sites may lead to you installing a fake antivirus that will steal data. After checking and cleaning, update the signature databases and scan again.
⚠️ Attention: Never grant the antivirus the “Accessibility” rights unless this is required to treat active threats. Attackers often use this mechanism to intercept control.
If your antivirus finds a threat but cannot remove it, follow the instructions on the screen. Typically a reboot into safe mode or special permissions is required. In extreme cases, when a virus blocks the work of the defender, a complete reset of the device may be required.
Radical measures: reset and protection in the future
If all verification methods indicate the presence of wiretapping, but it cannot be removed, the only reliable option remains - a full reset to factory settings (Hard Reset). This is guaranteed to remove any software installed by the user, including hidden spyware. Before doing this, be sure to save important contacts and photos to the cloud or on your PC.
To perform a reset, go to Settings → General settings → Reset → Reset data. The device will be completely cleaned. After setting up your phone as new (don't restore your backup of your apps right away!) carefully monitor its behavior. Install apps only from trusted sources.
Why shouldn't you restore the backup right away?
Infected application installation files could have gotten into the backup. By restoring them, you will return the virus to the system again. It is better to install the applications again from the store.
To prevent future attacks, enable Google Play Protect in the application store settings. This feature automatically scans for installed apps. Also use two-factor authentication for all important accounts and change passwords regularly. Don't grant superuser (Root) privileges unless absolutely necessary, as this disables many layers of Android security.
Remember that your best defense is your digital literacy. Do not follow suspicious links in SMS, do not connect to open Wi-Fi networks without a VPN, and do not give your phone to strangers, even for a minute. Vigilance combined with technical controls will ensure your privacy.
☑️ Final security check
Can wiretapping work without the Internet?
Yes, some advanced systems can record conversations and save them to the internal memory of the phone, waiting for the moment when the device connects to Wi-Fi or other data network. However, to transmit real-time audio, the Internet is required.
Does resetting the settings remove the virus forever?
In 99% of cases, yes. The exception is viruses embedded directly into the system partition of the firmware (which is extremely difficult to do on a modern Samsung with a locked bootloader) or hardware “bugs” built into the phone’s board.
Will codes like #0# help you find a wiretap?
Code #0# is intended for testing hardware (screen, sensors, vibration) and does not show information about software spying. To check security, use forwarding codes and traffic analysis.
Can a telecom operator listen to my conversations?
Technically, the operator has access to the data stream, but mass wiretapping of subscribers without court approval is impossible and illegal. In the context of this article, we are looking at threats from third parties using malware on your device.
What is developer mode and is it dangerous?
Developer mode allows access to USB debugging. If it is turned on and connected to someone else's computer, an attacker can gain full access to the phone's files. Regular users are recommended to keep this mode turned off.