Steve Gibson in TWIT Pages 10-15 'A Spy in Our Pocket" Talking about how smartphone handsets communicate with their manufacturer, beyond simple test data, and provide information when combined with other data, that can determine our activities. Extract:
"...In 2020 it is estimated that in the US there are 113M iPhone users and 129M Android users. Assuming all of the Android users have Google Play Services enabled then scaling up our measurements suggests that in the US alone Apple collects around 5.8 GB of handset data every 12 hours, while Google collects around 1.3 TB of handset data. When the handset is idle, the average time between iOS connections to Apple is 264 seconds, while Android connects to Google on average every 255 seconds. In other words, both operating systems connect to their back-end servers on average every 4.5 minutes even when not being used. ... "
Full technical research paper on this: https://www.scss.tcd.ie/doug.leith/apple_google.pdf
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