Concerns about digital privacy have grown as monitoring and tracking apps become more powerful and widely available. While many of these tools are marketed for legitimate uses — such as parental supervision or employee device management — experts say some can also be misused to secretly monitor a person’s activity.
Below is a clear look at the types of apps commonly associated with phone surveillance, what they do, and how to recognize potential risks.
Monitoring apps that can track your activity
Certain software is specifically designed to monitor a device’s activity and send reports to another person’s dashboard. One example is mSpy, a monitoring program that can log texts, calls, GPS location, social media activity, and more.
Other monitoring tools advertise similar capabilities, including:
- Reading messages and emails
- Tracking real-time location
- Viewing browsing history
- Logging keystrokes
- Monitoring installed apps
Some monitoring apps even claim they can run in stealth mode, meaning the phone’s owner may not see alerts or icons showing the app is active.
Another example is KidGuard, a parental monitoring app that allows access to text messages, browser history, photos, emails, and GPS data from the target phone.
Although these tools can be used legally — such as by parents monitoring a child’s device — using them on someone else’s phone without permission is illegal in many places.
Why these apps raise privacy concerns
Researchers studying spyware have found that some monitoring apps transmit sensitive data — including photos, messages, and location — through insecure channels, making it easier for third parties to intercept that information.
In addition, legitimate apps can still pose risks if they collect excessive data. The more information an app gathers, the greater the potential harm if that data is misused or leaked.
Academic research also shows that some sideloaded monitoring apps (those installed outside official app stores) lack safeguards and may conceal themselves on a device. In one study, 8 out of 20 such apps were flagged for potential stalkerware indicators.
Signs your phone could be monitored
Security experts say unusual device behavior can sometimes indicate hidden surveillance software. Possible warning signs include:
- Rapid battery drain
- Overheating when idle
- Sudden spikes in data usage
- Random screen activity or messages
Because these apps often run constantly in the background, they consume processing power and data.
However, experts stress that simply having a certain app installed does not automatically mean someone is spying on you — suspicious permissions or unknown apps are more reliable indicators.
How spyware can get installed
In many cases, spyware requires physical access to the device to install. If no one else has handled your phone for more than a few seconds, experts say the risk is much lower.
Apps designed for monitoring often hide their icons or appear under generic names like “System Update” or “Service Manager,” making them harder to recognize.
How to check your phone
Security guidance recommends several steps to review your device:
- Look through your full app list in settings.
- Remove apps you don’t recognize.
- Check permissions for camera, microphone, and location.
- Enable built-in security scanning tools.
For example, Android’s app list can reveal hidden or disguised apps, and iPhones have an App Privacy Report that logs when apps access sensitive features.
The bigger picture
Security researchers estimate that mobile malware continues to grow rapidly, with millions of new variants appearing regularly.
This doesn’t mean every device is compromised — but it does show why staying aware of installed apps and permissions is important.
Conclusion
Apps capable of monitoring phones exist and can access highly personal data if installed. Many are designed for legitimate purposes, yet they can be misused if someone installs them without permission.
Understanding how these apps work, what warning signs to watch for, and how to check your device can help you protect your privacy and stay in control of your own data.
