Connection control: how to check who is on your Samsung

The modern smartphone has turned into a digital fortress where banking data, personal correspondence and access to social networks are stored. However, users often wonder if someone else has entered their device without the owner's knowledge. This is especially true for popular devices Samsung Galaxywhere a complex ecosystem can hide unobvious attack vectors.

Checking active sessions and connected devices is not just paranoia, but a necessary measure of digital hygiene. Attackers can exploit Bluetooth vulnerabilities, open Wi-Fi hotspots, or phishing links to gain remote access. In this article, we will analyze in detail the built-in protection tools Android and specific shell functions One UIthat will help identify uninvited guests.

⚠️ Attention: If you notice a sharp decrease in Internet speed or a rapid drain on the battery without active actions, this may be the first sign that your device is being used by third parties for mining or data transfer.

Analysis of active sessions in your Google account

The most common way to remotely control your phone is to log into your Google account from another device. If an attacker has obtained the password, he can synchronize contacts, read mail, and even track geolocation through the Find My Device service. To start checking, you need to go to the security settings of your profile.

Go to menu Settings → Google → Google Account Management. Here you are interested in the "Security" tab. Scroll down to the "Your Devices" section. This list displays all the gadgets that are currently authorized under your account. Carefully study the model names, device types and last login time.

If you see a device that does not belong to you, or you logged in from an unfamiliar city, log out immediately. Click on the suspicious device and select the option Sign out. After this, it is strongly recommended to change your password and enable two-factor authentication to prevent repeated hacking.

Remember that some devices may appear as "Unknown Device" or under a technical model name that you may have forgotten. Check the date of last use: if the login was a month ago, and you did not use this gadget at that time, this is a cause for alarm.

Checking connections via Bluetooth and Wi-Fi Direct

In addition to cloud accounts, local connections can be made through wireless interfaces. The function Wi-Fi Direct and protocol Bluetooth allow you to transfer files and even broadcast the screen without an Internet connection. An attacker within range may try to pair with your phone.

To check active Bluetooth connections, open Settings → Connections → Bluetooth. The "Connected devices" section displays gadgets with which an active link is established. If you see headphones, watches or another phone that you are not currently using, disconnect the connection by clicking on the settings icon next to the name and selecting Settings → Connections → Bluetooth Disconnect Particular attention should be paid to the Quick Share function in smartphones Samsung. It allows other devices to detect your phone and send files. Make sure that the "Contacts only" mode is selected in the Quick Share settings or the function is completely disabled if you do not plan to use it. Disable.

Particular attention should be paid to the Quick Share function in Samsung smartphones. It allows other devices to detect your phone and send files. Make sure your Quick Share settings are set to Contacts Only or completely disabled if you don't plan to use it.

Connection type	Where to check	Hack sign	Action
Google Account	Settings → Google	Unfamiliar device in the list	Log out and change password
Bluetooth	Settings → Connections	Active connection to unknown gadget	Disconnect and forget the device
Wi-Fi Direct	Wi-Fi settings	Request to connect or transfer files	Reject request
USB debugging	Developer Settings	Confirm debugging without your participation	Disable and disable debugging

Also check your Wi-Fi connection history. Go to Wi-Fi settings and look at the list of saved networks. If there are networks with suspicious names that you have never connected to, delete them. Sometimes malicious access points disguise themselves as well-known network names (for example, "Free_WiFi_Mall") in order to automatically connect to your phone.

Identification of hidden applications and device administrators

The most dangerous type of connection is the installation of spyware that runs in the background. Such apps often hide their icon from the application menu and disguise themselves as system processes. To detect them, you need to conduct a deep audit of installed apps.

Start by checking the list of all applications. Go to Settings → Applications. From the menu (three dots in the corner), select the "Show system applications" option. Carefully review the list for strange names, applications without icons, or duplicate system utilities. If you find something suspicious, click on it and select Settings → Applications Uninstall Applications with device administrator rights are especially dangerous. They can block the removal of malware. You can check them in the section Delete.

Applications with device administrator rights are especially dangerous. They can block the removal of malware. You can check them in the section Settings → Biometrics and security → Other security settings → Device administrator applications. Only the Find My Device service from Google or Samsung should be active here. Any other checkboxes must be unchecked.

How are hidden applications disguised?

Malware often uses names like “System Update,” “Wi-Fi Service,” or “Android Core.” They may not have an icon in the general menu, but appear in the list of application settings. If you see a process that consumes a lot of traffic or battery, but cannot find its icon, this is a sure sign of a spy.

⚠️ Attention: If the "Uninstall" button for a suspicious application is inactive, first revoke administrator rights in the corresponding menu. Without this step, it is impossible to remove the virus.

Another detection method is to check applications that may be displayed on top of other windows. This allows you to intercept keystrokes and bank card data. Path to setting: Settings → Applications → Special access → On top of other applications. Disable this feature for all apps except instant messengers and system utilities that you trust.

Monitoring traffic and battery consumption

Indirect, but very reliable sign that your phone someone else is connected is an anomalous behavior of system resources. Spyware constantly transmits data to the attacker's server and records screen activity, which creates a high load.

Analyze mobile network consumption. Go to Settings → Connections → Data usage → Mobile data. View the list of applications for the current month. If you see an unknown application or system process that has consumed gigabytes of traffic, although you have not used it, this is an alarming signal.

Carry out a similar check for battery consumption. Go to Settings → Device maintenance → Battery. The list should only contain applications that you have actually used. If “Calculator” or “Flashlight” occupy the first lines in terms of energy consumption, it means that malicious code is hidden under their name.

• 📉 Sharp discharge: The phone is discharged in 3-4 hours with moderate use.
• 🔥 Heating: The device body is hot even in standby mode.
• 📡 Traffic: Exhausting the Internet package ahead of schedule without watching a video.
• 📢 Interference: Strange clicks or echoes during normal phone calls.

Modern versions One UI have a built-in activity monitor that shows which applications were using the camera or microphone in the background. Pay attention to the green indicators in the status bar - they indicate the operation of the sensors.

Using Security Mode for Diagnostics

If standard methods do not produce results, but suspicions remain, the most effective way to check is to boot in Safe Mode (Safe Mode). In this mode, the smartphone starts only with pre-installed system applications, blocking all third-party software.

To enter this mode on Samsung, hold down the power button until the shutdown menu appears. Then press and hold the Power Off icon on the screen with your finger until you are prompted to reboot into Safe Mode. Confirm the action.

After the reboot, the words “Safe Mode” will appear in the lower left corner of the screen. Use the phone for a while. If the battery, traffic, or strange behavior issues go away, then one of the apps you installed is to blame. You will need to remove recently installed apps one by one until the problem is resolved.

To exit safe mode, simply reboot the device in the usual way. Do not forget that some functions may be limited in this mode, but for diagnosing threats it is the best tool.

Dramatic measures: resetting settings and protecting in the future

If you have found confirmed cases of unauthorized access and cannot remove malware using conventional methods, the only reliable solution is a full reset to factory settings. This will remove all data, including hidden viruses.

Before the procedure, be sure to save important photos and contacts to the cloud or to your computer, but do not restore a backup copy of applications immediately after the reset, as you can return the virus along with the data. Perform a reset through the menu Settings → General settings → Reset → Reset data.

After returning the phone to its factory state, install a reliable antivirus from a well-known vendor, for example Kaspersky or Dr.Web, and conduct a full check. In the future, avoid installing applications from unknown sources and do not click on suspicious links in SMS.

⚠️ Attention: The menu interface and item names may vary slightly depending on the version of Android and the model of your Samsung. If you cannot find the item you need, use the search at the top of the settings menu.

Frequently Asked Questions (FAQ)

Can someone connect to my phone just by number?

Technically, just knowing the phone number does not give direct access to the device. However, scammers can use the number for phishing (sending links) or trying to guess passwords in instant messengers. Direct connection is only possible if you yourself installed a malicious application or followed a dangerous link.

How can I find out if someone is reading my WhatsApp or Telegram messages?

In the settings of these messengers there is a section “Active sessions” or “Devices”. All phones and computers where your account is open are displayed there. If you see an unfamiliar device, click "End all sessions" and change your account password.

Does the phone show a notification if it is connected?

When trying to connect via Bluetooth or Wi-Fi Direct, the phone always asks for confirmation. However, if malware is already installed, it can intercept permissions automatically. Therefore, it is important to check the list of applications with special rights.

Is it safe to use public Wi-Fi in a cafe?

Using open networks carries the risk of data interception. It is recommended not to enter banking information or passwords on such networks. It is better to use the mobile data or enable a VPN service to encrypt traffic.

What to do if the phone turns on the screen or opens applications by itself?

This is a clear sign of the presence of a Trojan or remote access app. Immediately turn off the Internet (Wi-Fi and mobile data), go to safe mode and remove recently installed applications or reset the settings.