From call records to sensors, your phone reveals more about you than you think

The Federal Trade Commission filed suit against Kochava Inc. on Aug. 29, 2022, accusing the data broker of selling geolocation data from hundreds of millions of mobile devices. Consumers are often unaware that their location data is being sold and that their past movements can be tracked, according to the commission.

The FTC’s suit specified that Kochava’s data can be used to track consumers to sensitive locations, including “to identify which consumers’ mobile devices visited reproductive health clinics.”

When the U.S. Supreme Court overturned Roe v. Wade on June 24, 2022, many people seeking abortion care found themselves in legal jeopardy. Numerous state laws criminalizing abortion thrust the perilous state of personal privacy into the spotlight. As a cybersecurity and privacy researcher, I’ve seen how readily people’s movements and activities can be tracked.

If people want to travel incognito to an abortion clinic, according to well-meaning advice, they need to plan their trip the way a CIA operative might – and get a burner phone. Unfortunately, that still wouldn’t be good enough to guarantee privacy.

Using a maps app to plan a route, sending terms to a search engine and chatting online are ways that people actively share their personal data. But mobile devices share far more data than just what their users say or type. They share information with the network about whom people contacted, when they did so, how long the communication lasted and what type of device was used. The devices must do so in order to connect a phone call or send an email.

Who’s talking to whom

When NSA whistleblower Edward Snowden disclosed that the National Security Agency was collecting Americans’ telephone call metadata – the Call Detail Records – in bulk in order to track terrorists, there was a great deal of public consternation. The public was rightly concerned about loss of privacy.

Researchers at Stanford later showed that call detail records plus publicly available information could reveal sensitive information, such as whether someone had a heart problem and their arrhythmia monitoring device was malfunctioning or whether they were considering opening a marijuana dispensary. Often you don’t have to listen in to know what someone is thinking or planning. Call detail records – who called whom and when – can give it all away.

The transmission information in internet-based communications – IP-packet headers – can reveal even more than call detail records do. When you make an encrypted voice call over the internet – a Voice over IP call – the contents may be encrypted but information in the packet header can nonetheless sometimes divulge some of the words you’re speaking.

A pocket full of sensors

That’s not the only information given away by your communications device. Smartphones are computers, and they have many sensors. For your phone to properly display information, it has a gyroscope and an…

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