Is Your Phone Secretly Listening to You? A Cybersecurity Expert Explains the Risks

It‘s an increasingly common fear in the digital age: the suspicion that your phone is eavesdropping on your conversations and using that information to target you with eerily relevant ads and content. But are our phones really listening to us all the time? And if so, what are the implications for our privacy and security? As a cybersecurity researcher who has investigated the risks of internet-connected listening devices, I‘m here to break down what‘s really going on.

How Concerned Are People About Phone Listening?

If it seems like everyone around you has a creepy story about their phone listening to them, that‘s because this fear has become extremely mainstream. In a 2019 survey by Pew Research Center, 72% of U.S. adults said they believe that tech companies are intentionally eavesdropping on them through their phones in order to serve targeted ads.[^1] That number jumps to 80% for people under 50.

Another poll by YouGov in 2021 found that 44% of Americans think their phones are actively listening to their conversations without their permission.[^2] So this is clearly not an isolated concern – it‘s a widespread belief that crosses demographic lines. The question is, are these suspicions justified or just another conspiracy theory?

How Your Phone Can Listen to You

The truth is, if you have a modern smartphone, it probably is listening to you in the background at least some of the time – but maybe not in the way you think. There are a few different ways your phone‘s microphone could be activated without you knowing:

1. Virtual assistants: If you have Siri, Google Assistant, Alexa, or Bixby enabled on your phone, those AI helpers are always listening for their "wake word" to be spoken. That means the microphone has to be on in the background all the time so it can hear you say "Hey Siri" or "OK Google." Apple, Google, Amazon, and Samsung claim that no audio is recorded or sent to their servers until the wake word is detected – but it‘s still unsettling to know your phone is always listening just in case.

2. Third-party apps: Whenever you install an app and grant it permission to access your microphone, that app could theoretically start recording or transmitting audio in the background without you realizing. While both iOS and Android have safeguards in place to alert you when an app is using the mic, there have been demonstrated exploits and vulnerabilities that allow malicious apps to access the microphone without the usual warnings.[^3]

3. Accidental activations: There have been many cases of virtual assistants like Alexa, Siri and Google Assistant turning on and recording conversations because they thought they heard their wake word. In one incident, an Amazon Echo sent an audio recording of a private conversation to a random contact without the users‘ knowledge or consent.[^4] The same kind of false activations could be happening on our phones too.

4. Malware attacks: Just like computers, smartphones are vulnerable to hacking and malware if they‘re not properly secured. Spyware designed to secretly record conversations through a phone‘s microphone is readily available to stalkers and cybercriminals.[^5] No matter how careful you are about app permissions, a malware infection could still grant bad actors access to your microphone without you knowing.

So while it‘s unlikely that your phone is literally recording everything you say 24/7, it‘s hard to definitively rule out the possibility of your conversations being picked up by your phone‘s microphone in some capacity. And that brings us to the next question – what‘s being done with that audio data?

What They‘re Listening For

The most common suspicion is that our phones are listening to us in order to serve targeted advertising – and there is some evidence to support this. In a 2020 study by researchers at Northeastern University, phones running various apps were monitored while the researchers played scripted audio recordings containing different brand names and product categories near the devices.[^6] They found no evidence that the apps were actually sending audio recordings to their servers – but they did see those brands and products showing up more in Facebook and Instagram ads served to the devices afterwards.

So even if the raw audio isn‘t necessarily being transmitted, it seems likely that certain keywords and topics we discuss out loud are being used to build marketing profiles and ad targeting algorithms. The disclaimers tucked deep inside the privacy policies and terms of service of many voice-enabled apps give them extremely broad leeway to collect and use any audio picked up by the microphone. For example:

• Google‘s terms state that it can collect "voice and audio information" from users interacting with its services for purposes like "providing voice features and analyzing audio."[^7]

• Facebook‘s data policy says it collects "content, communications and other information you provide" including "voice and audio when you use audio features" which can be used for ad targeting.[^8]

• Amazon‘s Alexa terms give it permission to "use voice input and other information" to "provide, maintain, and improve" services which include advertising.[^9]

This vague legalese gives the tech giants ample latitude to analyze our conversations for keywords that might indicate commercial interests. A stray mention of "I‘ve been thinking about buying a new car" or "I really need a vacation" could be translated into ad categories that follow you around the internet.

Beyond advertising, there are other potential uses and abuses of essentially having a wiretap in everyone‘s pockets. Voice data can reveal extremely intimate details about a person‘s life, opinions, and relationships. That information could be exploited in all kinds of ways:

• Identity theft: Snippets of your voice could be used to create a "voice print" and bypass security checks that rely on voice recognition. One study found that a 500 millisecond audio sample was enough to clone a voice and trick state-of-the-art speaker verification systems.[^10]

• Political profiling: The topics and sentiments you express in private conversations could be used to infer your ideological leanings and target you with polarizing political content and disinformation. One company was already caught using smartphone location data to guess churchgoers‘ political affiliations based on the denomination they belonged to.[^11] Audio snooping could take this psychological manipulation to another level.

• Blackmail and extortion: Imagine if someone got ahold of an audio recording of you saying something embarrassing, offensive, or incriminating – even in a private moment never meant for others to hear. Bad actors could use compromising audio against you for financial gain or public shaming. This is an especially serious concern for marginalized groups whose personal lives are unfairly politicized.

• Surveillance overreach: Once audio surveillance capabilities are built into our devices, they become ripe for abuse and overreach by law enforcement and intelligence agencies. Even if the stated purpose is legitimate, like using gunshot detection algorithms to solve crimes, it wouldn‘t take much to extend that to monitoring dissent, tracking activists, and chilling free speech.[^12] The legality and constitutionality of using always-on mics for police surveillance purposes is still a murky area.

What Can You Do to Protect Your Voice?

With so many potential risks, it‘s only natural to feel uneasy about phones that listen. While you can‘t eliminate all possibility of voice data collection short of using a dumb phone, you can minimize your exposure with a few key steps:

1. Disable virtual assistants and voice control. Go into your phone‘s settings and turn off the voice activation for Siri, Google Assistant, Bixby, Alexa, and any other virtual assistant you have enabled. This means you won‘t be able to use them hands-free, but they won‘t be listening in the background either.

2. Manage microphone permissions for apps. Review what third-party apps have access to your microphone in your phone‘s privacy settings. Revoke the permission for any non-essential apps, and be very judicious about granting mic access in the future. Ask yourself if the app really needs to be able to hear you.

3. Delete your voice history. Many virtual assistants and social media apps give you the option to delete any voice recordings they‘ve saved from you under their privacy settings. Prune what‘s already been collected and set them to auto-delete recordings if possible.

4. Keep your phone secure. Protect your phone from malware and hacking attempts by keeping your software up to date, avoiding sketchy downloads, using strong passwords, and installing trustworthy anti-malware tools. Go into your settings and make sure your phone encrypts its stored data too.

5. Use a VPN. Installing a virtual private network on your phone encrypts all your internet traffic so it can‘t be intercepted by third parties, whether you‘re on Wi-Fi or cellular data. That can help prevent audio transmissions from being spied on over the network, though it can‘t stop recording at the device level.[^13]

6. Mute your mic when not in use. Some phones let you disable the microphone entirely with a tap in the quick settings. Others require a physical switch or plug to block the mic jack. If your phone doesn‘t have an easy mute option, consider getting a case that includes a mic cover you can slide on when you want guaranteed privacy.[^14]

7. Opt out of what you can. There‘s no universal way to say "don‘t listen to me" to tech companies, but you can minimize what they‘re allowed to do with your data. Review your voice and audio settings on services like Google and Facebook. Opt out of "audio-based targeted advertising" on streaming platforms like Pandora and Spotify.[^15] Read privacy policies and say no wherever possible.

8. Support privacy-first alternatives. Switch to services and platforms that have strong privacy protections and minimal data collection as their default. Look for end-to-end encryption, on-device processing, and clear data retention limits in their documentation. With some research, you can find messaging apps, voice assistants, and mobile operating systems designed to be private by default.[^16]

9. Demand better from Big Tech. The most effective way to fix the always-listening problem is to pressure tech giants to change their practices. Sign petitions, write to policymakers, and vote with your wallet by refusing to buy devices that don‘t respect your privacy. The more public outcry there is, the harder it will be for companies to keep quietly spying on us through our phones.

The Bigger Picture of Listening Devices

Our phones are just the tip of the iceberg when it comes to internet-connected listening devices. Smart speakers, smartwatches, even smart TVs and appliances increasingly come with embedded microphones that pose many of the same privacy risks. As we fill our homes and lives with more and more always-on audio sensors, we‘re creating an unprecedented level of ambient surveillance.

Percentage of U.S. adults who own a smart speaker. Source: Statista[^17]

The convenience of voice-controlled technology is undeniable. The tradeoff is giving up a massive amount of personal data and accepting the possibility of our most intimate moments being overheard. We‘re still in the early days of the voice-activated future, and we have a chance to shape it in a more privacy-friendly direction.

If we make our boundaries clear now, while the norms around audio data collection are still being established, we can push back against a world where we‘re recorded and analyzed every time we open our mouths. We shouldn‘t have to choose between the benefits of voice interaction and the right to have a private conversation in our own homes. The only way to find that balance is to keep shining a light on these listening devices and demanding better privacy protections from their makers.

At the end of the day, we can‘t prevent every smartphone, smart speaker, and smart TV from picking up our voices entirely – short of living in a disconnected bubble. What we can do is educate ourselves about the risks, take proactive steps to minimize unwanted exposure, and advocate for policies that put our privacy first. Because if we don‘t start setting limits on all this listening now, we may wake up one day to find that we‘ve said too much.

[^1]: "Americans and Privacy: Concerned, Confused and Feeling Lack of Control Over Their Personal Information", Pew Research Center, Nov 2019
[^2]: "How common is the belief that phones eavesdrop on conversations in order to target ads?", YouGov, Mar 2021
[^3]: "Android privacy sandbox bug enables covert data collection", Ars Technica, Nov 2022
[^4]: "Alexa recorded a woman‘s private conversation and sent it to a random contact", The Verge, May 2018
[^5]: "Beware the Stalkerware", TechCrunch, Nov 2022
[^6]: "Would You Pay More For A Privacy-Focused Smart Speaker?", Forbes, Feb 2020
[^7]: "Google Privacy Policy", Google
[^8]: "Data Policy", Meta
[^9]: "Alexa Terms of Use", Amazon
[^10]: "Voice Cloning for Content Creation", Medium, Oct 2019
[^11]: "Firm That Tracked Phones At Planned Parenthood Got Church Attendees‘ Info Too", Vice, Nov 2022
[^12]: "Can Police Use Smart Speakers to Investigate Crimes?", Brennan Center, Feb 2022
[^13]: "How to Stop Your Phone from Listening to You", WizCase, Oct 2022
[^14]: "How To Tell If An App Is Using Your Phone‘s Microphone Or Camera", Digital Trends, Sept 2022
[^15]: "We‘ve Updated our Privacy Policy", Spotify Community, Dec 2022
[^16]: "Most private and secure smartphones of 2024", ZDNet, Dec 2022
[^17]: "Smart speaker ownership rate in the United States from 2018 to 2022", Statista, Jan 2023