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Is your smartphone listening to your conversations?

The truth behind those eerily accurate ads

Published : Wednesday, 11 November, 2026 at 6:04 PM

Sakia Kawser Siddique

You are chatting with a friend about buying a new phone, planning a holiday or trying a particular skincare product. You have not searched for it online. Yet, a few hours later, an advertisement for exactly that product appears on your social media feed.

It feels as if your smartphone has been listening.

The suspicion is not new. Millions of users have questioned whether apps secretly activate phone microphones to collect private conversations and turn them into advertising data. But the reality is more complicated — and, in some ways, more concerning.

Is your phone actually listening?

There is no convincing scientific evidence that popular apps routinely record people’s private conversations through smartphone microphones to target advertisements on a large scale.

A major study by researchers from Northeastern University, published in 2018, examined the behaviour of 17,260 Android apps. The researchers found no evidence that the apps secretly activated microphones and transmitted recorded conversations. However, they identified other privacy risks, including apps that captured screenshots and shared screen activity with third parties without users being aware of it.

A separate 2019 academic study examining the feasibility of mobile eavesdropping also found that large-scale secret recording had not been established by the available evidence. The researchers cautioned, however, that the absence of detected cases does not prove that every possible form of covert surveillance is impossible.

This distinction matters. It would be misleading to claim that smartphones are constantly recording users. It would be equally misleading to assume that everything happening inside apps is harmless or fully understood.

How do advertisements know what you want?

The explanation often lies in the enormous amount of information collected through everyday digital activity.

Searches, websites visited, videos watched, products viewed, online purchases, location information and interactions with social media posts can all help build a picture of a user’s interests.

The US Federal Trade Commission explains that websites and apps use tracking technologies, including cookies, advertising identifiers and device fingerprinting, to monitor online activity. Information gathered across different websites and devices can help advertisers deliver personalised advertisements.

Consider a simple example. You search for a particular type of shoe, visit an online shop and watch a video about running. You may later see advertisements for sportswear on a social media platform. The platform does not necessarily need to hear your conversation to make that connection.

Advertisers and technology companies can also use information supplied by other businesses. A 2024 FTC report on social media and video-streaming services found that companies used information from data brokers, including data related to household income, location and interests, for targeted advertising.

That means an advertisement can appear surprisingly relevant because several pieces of digital information have been combined — not necessarily because a microphone captured a conversation.

The microphone is still a genuine privacy concern

Although routine secret recording for advertising has not been demonstrated, smartphone microphones are sensitive tools.

Voice assistants such as Siri, Google Assistant and Alexa are designed to respond to activation commands. To recognise a wake word, compatible devices may monitor for specific sound patterns. A device can sometimes mistake ordinary speech for an activation command, potentially recording audio unexpectedly.

The US Federal Trade Commission warns that voice assistants may record interactions and, in some circumstances, activate when they mishear a wake word. Users should therefore understand how recordings are stored and processed and review the relevant privacy settings.

There are also legitimate reasons for apps to request microphone access, including voice messages, video calls and audio recording. The concern arises when an app requests access that is unnecessary for its main function or when users do not understand how the permission may be used.

What can smartphone users do?

Users do not need to abandon smartphones to protect their privacy. They can, however, take a few practical steps.

Review microphone permissions: Check which apps can access the microphone and disable permission for those that do not need it.

Watch privacy indicators: Android 12 and later display an indicator when an app accesses the microphone or camera. iPhones also display an indicator when these sensors are in use.

Check app activity: On supported iPhones, App Privacy Report shows when apps access sensitive information, including the microphone, and which network domains they contact.

Limit location access: Allow location access only when necessary. Consider choosing access while using an app rather than all the time.

Review advertising settings: Check personalised advertising and tracking options on the phone and within social media accounts.

Remove unnecessary apps: Delete apps that are no longer used, particularly those requesting permissions unrelated to their functions.

These measures cannot eliminate every form of digital tracking, but they can reduce unnecessary access to personal information.

The bigger question is not just whether your phone hears you

The most important privacy question may not be whether a smartphone is secretly recording every conversation. It is how much information people voluntarily or unknowingly leave behind while using digital services — and how that information is combined, shared and used.

A person may never grant an app microphone access but still reveal a great deal through searches, shopping habits, location history and social media activity. The resulting profile can be detailed enough to make an advertisement feel as though it came directly from a private conversation.

Smartphones have made everyday life easier, but they have also turned personal data into a valuable commercial resource. Users often accept permissions without reading them, while privacy policies can be difficult to understand.

So, is your smartphone listening to you? There is no solid evidence that routine secret microphone recording is the explanation behind those eerily accurate advertisements. But the amount of information collected about people’s digital lives is real — and deserves far more attention.

Sources: Northeastern University; PoPETs, Panoptispy: Characterizing Audio and Video Exfiltration from Android Applications; US Federal Trade Commission; Apple Support; Android Open Source Project.