We at reviewscast review products to make your life better, by helping you choose the best deals and best products.

Why Are Motion Detectors On Smartphones Worrisome?


Motion detectors on smartphones have been used for audio eavesdropping because of their sensitivity and responsiveness to vibrations. However, this warning is considered low-risk as two widely acknowledged limitations: First, motion sensors can only pick up speech signals, unlike microphones traveling through a solid medium. So, the only possible setup reported earlier is to use a device’s gyroscope to tap on a speaker installed on the same table.

The second limitation comes from the common sense that these sensors can only pick up a narrow band of speech signals due to a sampling ceiling of 200Hz. So, a new side-channel attack operates a smartphone’s accelerometer sensor to tap on the speaker in the same smartphone. Specifically, it utilizes accelerometer measurements to recognize the speaker’s speech and reconstruct the corresponding audio signals.


Sensors are embedded in smartphones to enhance their controllability, usability, and management. The proximity sensor is added to enhance the device’s power management; i.e., if the device is near the user’s ear, the screen will automatically turn off.

Another sensor is the accelerometer that senses the screen’s position and rotates its screen depending on the device’s positions. And the last one is the battery sensor that controls the charging process and the battery’s temperature.

Research has shown that the data collected from these sensors can be utilized and understood to show other information.

According to its usage, any sensor may act as an active or a passive sensor. If the data collected from a sensor is leveraged in the same way as that device developers designed it, it is an active functionality. So, if the collected data has been described in new ways, these sensors function passively. If the sensors are leveraged in this way, a hidden information problem occurs.

Why are they risky?

The human voice within motion sensors like gyroscopes and accelerometers may present security flaws. These flaws can allow cybercriminals to collect confidential data as the users speak on or near a mobile device.

These motion detectors are easily available in smartphones and other smart wearable gadgets that have become a powerful feature in users’ life. Users do not have to provide newly installed applications permission to use them, unlike microphones, making these sensors prime tools for malicious activity. This topic of research is incredibly critical to help protect users from numerous real and hypothetical privacy invasions.

Laptop, stereo, and smartphone speakers, along with living voice, were tested at different volumes during the researchers’ threat analysis.

The research team studied various audio signal effects on a smartphone in different locations: on a different speaker, on the same surface as the speaker, and through the air.

The results read an accelerometer change when the motion detector and laptop speakers were on the same surface. Stereo speakers gave similar results, while smartphone speakers and human speech did not have enough power to register a response via aerial vibrations.

In recent research and resulting articles about the possible threat of smartphone sensors, the public opinion is that this threat is very serious. They could record in the same way that a microphone does. Research indicates that this is not the case, and motion sensors are very limited in their ability to pick up speech characteristics. An accelerometer or gyroscope can’t act in the same capacity that a microphone does.

At last, results suggest that motion sensors in smartphones may threaten communication privacy only in some limited scenarios.

Smartphones have become the new pc. In addition to being the main means of communication, we can play games, watch movies, and enjoy virtual reality experiences on our smart devices. But as smartphones are the embodiment of modern convenience, the dirty little secret is that these omnipresent devices, which we have with us 24/7, and keep switched on for most of that time, are also a serious threat to our privacy.


A smartphone’s key feature is locating itself via multi-alteration to cell towers or via the integrated GPS chip; this enables features like map navigation and tracking distances during running.

This geolocation information can be useful, and law enforcement can track a criminal via their phone. Several apps also track users and can use that information to see their activity and the time.

There are many reports of locating phones via the other sensors, including the barometer, accelerometer, and magnetometer. It is still an invasion of privacy, while disclosing location data may seem innocuous. Moreover, this data can easily be used to build a profile on a user, which is used for a phishing attack by hackers.

Malicious apps:

A user can expand a smartphone’s functionality by installing apps, allowing you to build a device with a personalized feature. However, some apps are often not from reputable sources, and they may help themselves to more information than is required.

The thing is that we voluntarily provide this data when we agree to the app permissions, and we should at least be a little more suspicious.

It’s recommended to download apps from more reputable sources, like the Google Play Store, and stay clear of unfamiliar websites.

Wi-Fi tracking:

Many public places offer free Wi-Fi, eager to stay connected, these places click to accept the terms of service and are thankful for the connection, with lots of modern smartphones able to use it for everything, including phone calls. This free Wi-Fi connection is too often, in reality, an intrusion of privacy.

Also, many departments emerged as using Euclid Analytics, which is a service to track shoppers. Euclid Analytics can determine which departments the shoppers have visited and how long they spent there via the free Wi-Fi. Forbes reports that more than 100 retailers use their service.

Lack of anti-virus software:

The requirement of anti-virus software is not as clear to most users, and this is carried out by lower adoption rates of anti-virus software on a device compared to PCs 61% of us use mobile banking on our smartphone despite the amount of personal info many of our phones contain and have access.

Even fake anti-virus apps and the Google Play Store aren’t consistently helpful either that are disguised malware. Be sure only to install genuine anti-virus software on your device.

Your camera could be watching you:

Smartphone cameras are a great convenience and include the statement that the best camera is the one you have.
However, smartphone cameras are also a security risk as they can be activated and used to spy on the owner.

Microphone eavesdropping:

Microphone in the smartphone is another security risk. Malware can also use microphones for data collection, while the main concern for many users maybe someone listening to private conversations.

Final Words

Most smart devices like phones, tablets, and other wearables are now equipped with many sensors, from the camera, GPS, and microphone to instruments like the proximity, gyroscope, NFC, and rotation sensors and accelerometer. So after knowing why the sensors of smartphones worrisome, be careful before allowing certain permission to apps and several sensors.