Do facebook listen to your microphone? No. Smartphones and tablets Generally speaking, mobile devices are tracked through an unique identified that can be accessed by all the apps. On iOS it's called the advertisingIdentifier and on Android the Advertising ID. This unique identifier is provided by the OS and allow all apps to identify a same device, which then allow advertisers and data brokers to merge datasets. iOS Now let's talk about your iPhone's Operating System: iOS. According to a study published in March 2021 (PDF) by a team of researchers from Trinity College in Dublin, iOS sends a lot

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