The modern smartphone has become not just a communication device, but a real digital safe that stores your passwords, correspondence, bank data and personal photos. That is why the question of how to check whether a phone is wiretapped or not is an Android is becoming critically important for millions of users. Leakage of confidential information can occur not only due to the actions of hackers, but also as a result of the installation of malware by close people or former partners.
Unfortunately, there is no universal “check security” button, since covert surveillance methods are constantly evolving. However, there are specific signs that indicate the presence of spyware in the system. In this article, we will analyze technical diagnostic methods, engineer codes and behavioral anomalies of your gadget that will help identify a threat.
Remember that spyware is often disguised as system processes, so ordinary attention to detail is more important here than having an expensive antivirus. If you notice strange symptoms described below, do not panic - follow the instructions for an accurate diagnosis.
Indirect signs of wiretapping and spyware
The first bell indicating that yours smartphone is under supervision, the device as a whole often becomes incorrect. Attackers need to transfer data (audio, video, geolocation) to a remote server, which creates an additional load on the gadget’s hardware. This influence can be tracked even without installing special utilities.
Pay attention to the rate of battery discharge. If previously your phone lived quietly until the evening with moderate use, but now it requires recharging by lunchtime - this is an alarming signal. Malicious apps run in the background 24 hours a day, activating the microphone and camera, which consumes a colossal amount of energy.
It is also worth analyzing the temperature of the case. Heating of the device at rest (when the screen is off and you are not doing anything) indicates high processor activity. Overheating may be caused by the process of encrypting and sending stolen data to the network.
⚠️ Attention: If the phone is hot even after a night in standby mode, immediately check the list of running applications in the battery settings. Third-party processes should not consume more than 5-10% of the charge when idle.
Another obvious sign is strange interface behavior. The screen may turn on spontaneously, applications may close, or the phone may reboot for no apparent reason. Such glitches are often caused by a conflict between system services and the embedded spyware module.
Analysis of traffic consumption and strange network activity
Transferring audio and video files requires significant communication channel bandwidth. If you don’t watch 4K videos or download heavy games, but your mobile data limit is exhausted in a couple of days, you should think about checking it. Spyware sends reports to attacker servers using your traffic.
For a detailed check, go to the settings of your device. The path usually looks like this: Settings → Connections → Data usage. Here you will see detailed statistics for each application. Look for apps with unclear names or system services that consume gigabytes of traffic in the background.
- 📉 A sharp increase in Internet consumption in the background without active user actions.
- 📡 The appearance of unknown Wi-Fi access points or strange Bluetooth connections.
- 📞 Delays when dialing a number or strange clicks during a call (although this is rare on digital networks).
- 📨 Receiving strange SMS with a set of characters that could be commands to control a botnet.
Pay special attention to applications that have access to networks, but visually you don’t use them. Viruses are often disguised as “System Update”, “Flash Player” or “Google Services”, but upon closer examination their icon may differ from the original by one pixel or the name may have a typo.
Use of engineering codes for Android diagnostics
Operating system developers Android have provided special service codes that allow you to display hidden information about network status and call forwarding. These codes work on most devices, although some manufacturers (for example Samsung or Xiaomi) may block them in their shells.
The most popular code for checking redirection is *#21#. After entering this combination in the dialer and pressing the call button, a window will appear on the screen with the status of all types of forwarding (voice, data, fax, SMS). If the status is “Not forwarded” everywhere, it means that your calls are not going to someone else’s number.
For a deeper check, you can use the code *#62#. It shows you where calls are routed when your phone is turned off or out of network coverage. This will usually show your carrier's voicemail number. If you see an unfamiliar landline or mobile number, this is a cause for serious concern.
*#06# - checking the IMEI of the device (check with the number on the box)
##4636## — testing menu (phone information, battery, statistics)
##197328640## — service menu (not available on all models)⚠️ Attention: Do not try to change settings in the engineering menus if you are not sure of your actions. View-only codes (
*#...) are secure, but button menus may reset network or IMEI settings.
Remember that advanced spyware can intercept these codes and show you false information that forwarding is disabled. Therefore, this method should be used as a primary, but not the only verification measure.
What to do if the codes do not work?
Some telecom operators or firmware block the entry of USSD codes into the call menu. In this case, try entering the code through the Engineering Mode application (if available) or through a standard typist, making sure that the SIM card is active. If all else fails, proceed to manually checking applications.
Manual checking of installed applications and access rights
The most reliable way to find a bug is a thorough audit of installed software. Attackers often install applications with device administrator rights, which allows them to hide from the regular list of apps and prevent removal.
Go to the section Settings → Security → Device Administrators (the path may differ depending on the version of Android). Here you will see a list of applications that have elevated privileges. If you see an unknown app there, especially with a name like "System Update" or "Wi-Fi Service", immediately revoke its rights and remove it.
| Application Type | Normal Behavior | Suspicious behavior |
|---|---|---|
| Messengers | Work only when you open or receive a notification | Constant activity in the background, high battery consumption |
| Flashlight | Requires access only to camera/flash | Requests access to contacts, microphone and SMS |
| System services | Have standard Google/Android icons | No icon or name with typos |
| Antiviruses | Well-known brands (Kaspersky, Dr.Web, ESET) | Unknown names that require disabling protection |
Also check the list of all applications through the menu Settings → Applications → Show system processes. Look for apps without icons or with an empty name. Viruses are often disguised using spaces in the name to blend into the background of the list.
☑️ Checklist for checking applications
Checking via computer and antivirus scanning
Sometimes built-in Android tools are not enough to detect complex threats. In this case, specialized anti-virus solutions and PC scanning come to the rescue. Connecting your phone to a computer allows you to see the file system in more detail, although modern versions of Android limit direct access to system folders without root access.
It is recommended to install a proven mobile antivirus, such as Dr.Web Light, Kaspersky Internet Security or Malwarebytes. Perform a full system scan. These databases contain signatures of known spyware such as Pegasus, FlexiSPY or various stealer Trojans.
If the antivirus finds a threat but cannot remove it (the “Delete” button is inactive), this confirms that the virus has administrator rights. Return to the administrators menu, uncheck the box next to the malicious application, and only then repeat the scan.
Before installing the antivirus, turn off the Internet (Wi-Fi and mobile data). This will prevent the spy from sending your data at the time of detection and blocking.
For advanced users, it is possible to check via ADB (Android Debug Bridge) from a computer. By connecting the phone in debug mode, you can display a list of all installed packages with the command adb shell pm list packages and check them against a database of known viruses on the Internet.
Radical measures: reset to factory settings
If you have tried all the methods, but suspicions remain, or the phone behaves inappropriately, the only The 100% solution is a complete data reset (Hard Reset). This procedure deletes absolutely all user data and returns the device to its “out of the box” state, destroying any software bookmarks.
Before performing a reset, be sure to save important contacts and photos to external storage or to the cloud, but do not restore a backup copy of applications immediately after the reset. You may accidentally return a virus along with your data. Reinstall applications manually from the official store Google Play.
The reset procedure is usually performed through the_recovery_ menu. Turn off the phone, then hold down the combination of buttons (most often Volume Down + Power or Volume Up + Power). In the menu that appears, select the item Wipe data/factory reset and confirm the action.
⚠️ Attention: Resetting to factory settings will delete all photos, contacts and correspondence without recovery possibilities. Make sure you have an up-to-date backup of your important data on an external storage device.
Hard Reset is the only guarantee of removing complex spyware that has embedded itself deep into the system and cannot be removed using standard methods.
Prevention and protection from future threats
After cleaning the device, it is important to change your usage habits, to prevent re-infection. Never install applications from unknown sources (APK files from forums, Telegram channels or third-party sites). The official store Google Play has strict security filters that filter out most threats.
Update your operating system and applications regularly. Android developers are constantly closing security vulnerabilities that hackers exploit. An outdated version of the OS is an open door for attackers.
- 🔒 Always use a screen lock (PIN code, pattern, fingerprint).
- 🚫 Disable installation from unknown sources in the security settings.
- 👀 Do not leave an unlocked phone unattended even for a minute.
- 🔄 Regularly change passwords for your Google account and social networks.
Remember that the best protection is your vigilance. If your phone suddenly begins to take on a life of its own, do not ignore these signals. A timely check can save you from serious financial and reputational losses.
Can a phone be tapped without installing apps?
Yes, there are methods of intercepting traffic at the operator level or through vulnerabilities in communication protocols (SS7), but they are available to intelligence agencies and cost a lot of money. For the average user, the threat comes precisely from installed spy applications.
Can a telecom operator listen to my conversations?
Technically, the operator has access to signal traffic, but wiretapping conversations without court approval and connecting special equipment (SORM) is illegal and difficult to implement for individuals. Most often, “wiretapping” is an application installed by someone.
Will airplane mode work against spyware?
Airplane mode disables data transfer, so the spy will not be able to send stolen information right now. However, the application itself will remain on the phone and continue recording as soon as you turn on the Internet. This is a temporary measure, not a solution.
How to remove a virus if it is not removed?
If the delete button is inactive, go to Settings → Security → Device Administrators and uncheck the suspicious application. After that, it will become a regular application and will be deleted in the standard way.
Will changing the SIM card help get rid of wiretapping?
No. Spyware is located in the phone's memory, not on the SIM card. Replacing the SIM card will not remove the virus, but it can temporarily break the attacker's communication channel with the device until you connect to the network again.
Are *#21# codes valid on all phones?
The codes work on most devices with pure Android and many custom firmware. However, some manufacturers (for example, Samsung in new models) or operators can block the display of this information through USSD requests.