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Turn off Bluetooth/GPS if is not being used
(lemmy.dbzer0.com)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Tracking can and is done with both by 3rd parties.
Not the best link, but Schiphol airport as a public example.