How smartphones share data when we're not using them

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Our smartphones are sharing data every four and a half minutes, according to research from Trinity College Dublin. Telemetry, automated recording and transmission of data from Apple and Android devices back to these company’s servers is going on even if the phone is only used to make calls. Professor Douglas Leith explains that even when a user has logged out of sending telemetry or they are not logged on, data is still being transmitted. (Image: Smartphone in pocket, Credit: Getty Images.)