How to check if someone has connected to my Android phone

The modern smartphone has become a digital twin of its owner, storing correspondence, bank access and personal photos. That's why the idea that someone else could remotely watch your screen or download data is a legitimate concern. Signs of compromise are often disguised as normal system failures, and the user may not be aware of unauthorized access for a long time. In this article we will examine in detail technical diagnostic methods that will help identify hidden connections and malicious apps. You will learn to analyze system logs, check active sessions in Google accounts, and recognize device behavioral anomalies that indicate an intrusion. unauthorized access.

In this article, we will examine in detail technical diagnostic methods that will help identify hidden connections and malware. You will learn to analyze system logs, check active sessions in Google accounts, and recognize device behavioral anomalies that indicate an intrusion.

Do not panic ahead of time, as many symptoms can be caused simply by a lack of RAM or outdated software. However, you cannot ignore alarming signals, because modern Trojans and remote administration tools (RAT) are able to carefully hide their presence in the system.

Analysis of the list of active devices in a Google account

The first and most reliable way to check is to audit devices that have authorization in your profile. Google allows you to see exactly where and when you logged in, and also gives you the ability to forcefully terminate suspicious sessions. To do this, you need to go to the security settings of your Google account.

Pay attention to unfamiliar models of phones, tablets or computers. If you see a device that you don't use, or the login was made from a city where you are not located, this is a direct sign that your password has been compromised. The Android security system is closely integrated with Google services, so control here is paramount.

It is important to check not only the type of device, but also the time of last activity. If a “smart” refrigerator or an old tablet showed activity 5 minutes ago, although you did not touch it, this is a reason to change your credentials. It is also worth paying attention to the permissions that connected devices have.

• 🔍 Check the "Your devices" section in your Google account settings for the presence of unknown equipment.
• 🚫 Click "Log out" or "End session" for any suspicious gadget in the list.
• 🔑 Immediately after logging out, change the password for account and enable two-factor authentication.
• 📱 Make sure that your current phone does not have extra passwords for logging into your account.

⚠️ Attention: If you see a device that you have already sold or given away, but it is still listed as active, immediately remove it from the trusted ones so that the new owner does not gain access to your email or photo.

Checking device manager and administrator rights

Attackers often give a malicious application device administrator rights so that it cannot be simply uninstalled. In this mode, the app gains deep access to the system and can block uninstallation attempts. Checking this section is a mandatory step in diagnosing security.

You can find this section by searching in the settings or by following the path Settings → Security → Device administrator applications. A list of apps that have elevated privileges is displayed here. As a standard, only system services should be located here, such as “Find My Device” from Google or corporate clients if the phone is working.

If you find an application here with a strange name, without an icon, or with a name masquerading as a system process (for example, "System Update" from an unknown developer), this critical sign of infection. Such apps are often used to install keyloggers or hidden data transfers.

Settings -> Security and privacy -> Other security settings -> Device administrator applications

If a suspicious element is detected, you must immediately revoke administrator rights. After this, the application will become normal and can be deleted using standard methods. If the uninstall button is grayed out, then malicious code is still blocking access.

• 🛡️ Disable administrator rights for all applications except Find My Device.
• 🗑️ If after disabling rights the application is not removed, go to Android safe mode.
• 📉 Pay attention to applications that which consume a lot of energy in the background.
• 🔒 Check if there is a hidden parental control app installed on your phone without your knowledge.

What is Safe Mode and how to enter it?

Safe Mode boots Android with only system apps. To enter, hold down the power button on the screen, and then hold your finger on the "Power off" button on the screen for a long time until you are prompted to switch to safe mode. In this mode, third-party viruses will not run and can be removed.

Monitoring outgoing traffic and connections

Modern spyware must transfer collected data (photos, audio recordings, correspondence) to a remote server. This creates abnormal network traffic. Even if you don't use the Internet, your phone can actively transfer data packets in the background.

Android's built-in tools allow you to track which application has consumed how much traffic. A sudden jump in data usage for an app that shouldn't seem to be using it (such as a calculator or voice recorder) is a red flag. It is also worth checking the use of Wi-Fi and mobile network separately.

For a more in-depth analysis, you can use the command adb shell netstatif USB debugging is enabled on your phone, but for the average user, the built-in traffic monitor is sufficient. Pay attention to applications with names consisting of a set of numbers or random letters.

Application	Using Wi-Fi	Using mobile. networks	Background activity	Status
Instagram	1.2 GB	300 MB	High	Normal
SystemCore (suspicious)	0 MB	5.4 GB	Permanent	Dangerous
Telegram	500 MB	120 MB	Average	Normal
Calculator	0 MB	15 MB	Low	Suspicious

If you find an application that “eats” gigabytes of traffic in the background, immediately restrict its access to the network. In the application settings, find the "Mobile data and Wi-Fi" item and turn off background transmission. This will temporarily stop the leak until you find and remove the source of the problem.

Behavioral anomalies and indirect signs

Often technical means of verification are not required, since the infected phone begins to behave strangely. Owners of Android devices may notice that the battery drains much faster than usual, even if the phone is idle. This is due to the fact that spyware constantly keeps the microphone, camera or GPS active.

Another sign is the screen, flash, or reboot spontaneously turning on. Your phone may become warm in your pocket even though you haven't used it for hours. You should also be wary if you hear clicks, echoes or extraneous voices when dialing a number, although in modern digital networks this is often a sign of problems with coverage, but wiretapping cannot be ruled out.

Slowdown of the interface, long responses to touches and constant pop-up advertising banners even on the desktop also indicate the presence of adware or more serious malware. The system simply cannot cope with the resource-intensive processes of the spy.

• 🔋 The battery is discharged by 20-30% after a couple of hours of inactivity.
• 🌡️ The phone body heats up noticeably without an active load.
• 📞 Interlocutors complain about echo or strange sounds during a conversation.
• 📲 SMS messages appear from unknown numbers with codes or strange links.

⚠️ Attention: Settings interfaces and menu item names may differ depending on the version of Android and the manufacturer’s shell (Samsung One UI, Xiaomi MIUI, etc.). If you cannot find the described item, use the search inside the settings menu.

Using USSD codes and engineering menu

There is a set of special codes that allow you to check the status of call and message forwarding. Attackers often set up forwarding to receive copies of your SMS with confirmation codes from banks. Checking these settings takes less than a minute.

Dial code *#21# to check the forwarding status of voice, SMS and data calls. If you see the status "Not forwarding", then everything is fine. If a phone number is specified that is not familiar to you, it means that your calls and messages are going to a third party.

To disable all types of forwarding, you can use a universal code ##002#. It resets all call forwarding settings to factory default. This is a useful command if you suspect someone is trying to intercept your two-factor authentication codes.

##002#

It's also worth checking to see if busy or unavailable only forwarding is enabled, using the codes #67# i #62# accordingly. These settings can be changed not only by a virus, but also by unscrupulous services or the previous owner of the SIM card.

Cardinal protection measures and reset

If you find confirmation hack, but cannot remove the malicious application in the usual way, or if suspicions remain too high, the only reliable solution is a full factory reset. This is guaranteed to remove any software injections.

Before the procedure, be sure to make a backup copy of important data (photos, contacts), but do not save settings and lists of applications, so as not to return the virus back along with the backup. After the reset, the phone will be like new, and you will have to reconfigure all services.

After the phone is brought back to life, the first thing to do is change all important passwords, starting with your Google account. Install a reliable antivirus from a reputable manufacturer and regularly update the operating system to close security vulnerabilities.

Frequently asked questions (FAQ)

Can someone connect to my phone just by number?

Technically, simply knowing a phone number does not make it possible to connect to a device or listen to conversations without installing special software. However, knowing the number, scammers can carry out social engineering attacks or send phishing links, clicking on which will lead to infection.

Will the phone show in the settings that it is casting the screen?

In modern versions of Android (starting from 10-12 and higher), when you activate screen casting or remote access, a corresponding icon (usually .cast) appears in the status bar (at the top of the screen) or similar). If there is no icon, but the phone behaves strangely, a deeper level of penetration may be used.

How to check if your phone has spyware?

Check the list of installed applications in the settings. Look for apps without a name, with a transparent icon, or system applications from unknown developers. It will also help to check in Settings → Applications → Accessibilitywhere keyloggers are often registered.

Is open Wi-Fi dangerous for connecting to my phone?

Open Wi-Fi itself is not Allows you to “connect” to your phone and control it if the phone does not have debugging ports open and file sharing is not enabled. However, through such networks, attackers can intercept your unencrypted traffic (passwords, correspondence) if you do not use a VPN.