Is my phone listening to my conversations to target adverts?

Everyone has the experience: you talk about a holiday, a mower, a brand you never search for, and an advert appears that afternoon. The explanation people reach for is the microphone. The evidence does not support it, and the actual explanation is worth understanding because it points at settings you can change, which the microphone theory does not.

Step by step

1. Know what researchers actually found.Studies that instrumented large numbers of apps, monitoring network traffic and microphone use, did not find audio being streamed for advertising. What they did find was extensive collection of everything else, including screen recordings sent to third parties by some apps.
2. Consider the engineering.Continuous audio capture and transcription for millions of users would be expensive, would show in battery and data use, and would be visible in traffic analysis. The signals advertisers already have are cheaper and better.
3. Understand what really produced the advert.Location history showing you at a garden centre. A shared home network linking you to someone who searched for it. Purchase data from a loyalty card. A contact graph — the person you were talking to searched for it. And ordinary browsing profiles built across thousands of sites.
4. Understand the frequency illusion.You notice the one advert that matches a conversation and forget the thousands that do not. You also start noticing a product after discussing it, so adverts that were always there become visible. Both effects are large and both are well documented.
5. Check what does have microphone access.Go through microphone permissions app by app and revoke anything without an obvious reason. Both phone platforms now show an indicator when the microphone is in use — watch for it. This is worth doing regardless of the advertising question.
6. Deal with the assistants that genuinely do listen.Voice assistants listen for a wake word by design, and recordings have historically been reviewed by humans for quality. Turn off voice history and review retention settings, or disable the assistant.
7. Attack the tracking that actually explains it.Turn off ad personalisation in your Google, Apple and Meta account settings, turn off cross-app tracking, set location permissions to while-using, and use a content blocker. That reduces the real mechanism.
8. Reset the advertising identifier.Both platforms have one and both let you reset or disable it. It is the thread that ties your activity together across apps.

Tips

• If you want to test it, be sceptical of your own test. Talking about an unusual product while holding a phone and then searching to see whether an advert appears contaminates the experiment immediately.
• The genuinely unsettling finding from the research was screen recording, not audio: some apps sent recordings of what users did in the app to analytics companies without disclosure.
• Smart speakers are a separate question, and the retention settings on those are worth reviewing properly.

Common mistakes

• Concluding nothing can be done because the microphone theory is wrong — The tracking that does explain it is extensive and is largely controllable through settings. The wrong explanation leads people to ignore the fixable one.
• Covering the microphone but leaving location history on — Location history is one of the mechanisms that actually produces these coincidences.

Questions people ask