Every Step You Take, Every Call You Make: Is Your Phone Tracking You? | McAfee Blog

So, what does your phone know about you? Taken all together it knows plenty — sometimes in ways that feel like your phone is watching you.

It all comes down to the data that courses through your phone and your apps, along with a phone’s built-in tracking capabilities. Indeed, your phone certainly knows plenty about you. And companies keep tabs on that. Here’s how…

The apps on our phones entertain us, inform us, and help us shop. Many of them also track our activities and location — and then sell or share that info with third parties. From there, that info can end up with data brokers who sell that info to anyone who’ll pay. That includes advertisers, spammers, insurance companies, hackers, law enforcement, private investigators, and so on. It’s all legal, and it’s all part of a multi-billion-dollar industry worldwide.

Still, you can take charge of your privacy amidst all this data and info gathering. Several steps can reduce what your phone collects and shares with others.

For starters, though, let’s look at several of the things your phone knows about you.

It likely knows where you are and where you’ve been

Unless you’ve turned it off completely, your phone can track you in several ways with several degrees of accuracy:

GPS: The Global Positioning System, or GPS as many of us know it, is a system of satellites run by the U.S. government for navigation purposes. First designed for national defense, the system became available for public use in the 1980s. It’s highly accurate, to anywhere between nine to 30 feet depending on conditions and technology used, making it one of the strongest tools for determining a phone’s location. This is what powers location services on cell phones, and thus can help an app recommend a great burger joint nearby.

Cell towers: Cell phone providers can track a phone’s location by the distance it is to various cell phone towers and by the strength of its signal. The location info this method provides is a bit coarser than GPS, providing results that can place a phone within 150 feet. It’s most accurate in urban areas with high densities of cell phone towers, although it does not always work well indoors as some buildings can weaken or block cell phone signals.

One of the most significant public benefits of this method is that it automatically routes emergency service calls (like 911 in the U.S.) to the proper local authorities without any guesswork from the caller.

Public Wi-Fi: Larger tech companies and internet providers will sometimes provide free public Wi-Fi hotspots that people can tap into at airports, restaurants, coffeehouses, and such. It’s a nice convenience, but connecting to their Wi-Fi might share a phone’s MAC address, a unique identifier for connected devices, along with other identifiers on the smartphone.

Taken together, this can allow the Wi-Fi hosting company to gather location and behavioral data while you use your phone on their Wi-Fi network.

Bluetooth: Like with public Wi-Fi, companies can use strategically placed Bluetooth devices to gather location info as well. If Bluetooth is enabled on a phone, it will periodically seek out Bluetooth-enabled devices to connect to while the phone is awake. This way, a Bluetooth receiver can then capture that phone’s unique MAC address. This provides highly exact location info to within just a few feet because of Bluetooth’s short broadcast range.

In the past, we’ve seen retailers use this method to track customers in their physical stores to better understand their shopping habits. However, newer phones often create dummy MAC addresses when they seek out Bluetooth connections, which helps thwart this practice.

Now, here’s where all that tracking gets tricky

Certain apps pair location info with other info they collect while you use that app. In some cases, an app shares that precise combination of info with third parties. (It all depends on the terms in the user agreement you accepted once you installed it.)

What does that look like in the real world? Third parties might know:

• Where you live, based on when your phone is at rest during the evening.
• Where you work, by seeing where you commute to on a regular basis.
• Where your children go to school, by tracking your weekday pickup and drop-off routine.
• Your religion, by pinpointing the location of the place where you worship regularly.
• Where you had dinner and who you had it with, when you split the tab with a payment app.

Those are just a few examples of many.

Just to emphasize what we said above, not every app sells shares or sells your info to third parties. However, that gets into the complicated nature of user agreements. The language that covers what’s collected, for what reasons, what’s done with it, and who it’s shared can be tough to tease out because it’s often written in some form of legalese.

Broadly though, apps need to request permission to access location tracking services. In the past, we’ve seen some sketchy apps request location permissions even though they have no reason to. Examples include coupon apps, wallpaper apps, productivity apps, and plenty of games too. When apps like those ask for permission to access location tracking services, raises a red flag that your privacy is in jeopardy.

It might know about your health

Depending on what apps and services you use, your phone might know a lot about your health. That can include range of info, as apps can track things like step counts, vital signs, and menstrual cycles. Other apps manage health conditions or work as symptom checkers. In all, this data can get very private. Unfortunately, sometimes that data winds up in the hands of third parties.

With that, we’ve seen cases where people’s medical info was shared without their knowledge by medical apps and services.

In April 2024, The U.S. Federal Trade Commission (FTC) ruled against an online mental health service that “disclosed consumers’ sensitive personal health information and other sensitive data to third parties for advertising purposes…”[i] Also according to the complaint, the company gave third parties personal data about its users including names, medical and prescription histories, pharmacy and health insurance info, and other health info.

Also in April 2024, U.S. healthcare provider Kaiser Permanente disclosed that more than 13 million people had some of their personal data shared by third parties via tracking technologies on its websites and apps. Companies such as Microsoft (Bing), Google, and X (Twitter) were all named.[ii] That info possibly included how people interacted with and navigated through their website or mobile app, along with search terms used in Kaiser’s health encyclopedia.

It might know what you’ve told Siri or Google Assistant

So, is someone on the other end of your smartphone listening to your recordings when you use Siri or Google Assistant? Possibly, yes. Companies make constant improvements to their devices and services, which may include the review of commands from users to make sure they are interpreted correctly. There are typically two types of review — machine and human. As the names suggest, a machine review is a digital analysis. Human reviews entail someone listening to and evaluating a recorded command or reading and evaluating a transcript of a written command.

However, several manufacturers let you opt out of those reviews. In fact, you’ll find that they post a fair share of articles about this collection and review process, along with your choices for opting in or out as you wish:

Ways to limit tracking on your smartphone

Turn off your phone or switch to Airplane Mode. Disconnect. Without a Wi-Fi or data connection, you can’t get tracked. While this makes you unreachable, it also makes you untraceable, which you might want to consider if you’d rather keep your whereabouts and travels to yourself for periods of time.

Turn off location services altogether. As noted above, your smartphone can get tracked by other means, yet disabling location services in your phone settings shuts down a primary avenue of location data collection. Note that your maps apps won’t offer directions, and your restaurant app won’t point you toward that tasty burger when location services are off, but you’ll be more private than with them turned on.

Provide permissions on an app-by-app basis. Another option is to go into your phone settings and enable location services for specific apps in specific cases. For example, you can set your map app to enable location services only while in use. For other apps, you can disable location services entirely. Yet another option is to have the app ask for permissions each time. Note that this is a great way to discover if apps have defaulted to using location services without your knowledge when you installed them.

On an iPhone, you can find this in Settings -> Privacy & Security -> Location Services. On an Android, go to Settings -> Locations -> App Locations Permissions.

Turn off app tracking. As you’ve seen, some apps will ask to track your activity and potentially share it with data brokers and other third parties. You can halt this by turning off app tracking. On an iPhone, go to Settings -> Privacy & Security -> Tracking and disable “Allow Apps to Request to Track.” On an Android phone, go to Settings -> Privacy and Security, then turn on “Do Not Track.”

And just as you can with location services, you can set apps to make tracking requests on an app-by-app basis. You’ll see it on the same screen that has the global “Do Not Track” option.

Opt yourself out of cell phone carrier ad programs. Different cell phone carriers have different user agreements, yet some might allow the carrier to share insights about you with third parties based on browsing and usage history. Opting out of these programs might not stop your cell phone carrier from collecting data about you, but it might prevent it from sharing insights about you with others.

To see if you take part in one of these programs, log into your account portal or app. Look for settings around “relevant advertising,” “custom experience,” or even “advertising,” and then figure out if these programs are worth it.

Delete old apps. And be choosy about new ones. Fewer apps mean fewer avenues of potential data collection. If you have old, unused apps, consider deleting them, along with the accounts and data associated with them. Our Online Account Cleanup Online Account Cleanup can make quick work of it. It scans for accounts you no longer use, shows how risky they are, and helps you delete them, along with your personal info. In all, breaches and leaks are a numbers game. The fewer you keep, the better, when it comes to protecting your personal info.

Remove your info from data broker sites. As we’ve seen, the personal info on your smartphone can wind up on data broker sites. And they’ll sell it to practically anyone. Our Personal Data Cleanup can help you remove your personal info from several of the sketchiest brokers out there. Running it periodically can help keep your info off those sites if it crops up again.

[i] https://www.ftc.gov/news-events/news/press-releases/2024/04/proposed-ftc-order-will-prohibit-telehealth-firm-cerebral-using-or-disclosing-sensitive-data?utm_source=govdelivery

[ii] https://www.hipaajournal.com/kaiser-permanente-website-tracker-breach-affects-13-4-million-individuals/