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Ask Jerry: Is my phone really spying on me?
Let's talk about tech.
The company that made the phone figures you want to talk into one end of a conversation if you plan on calling someone, so enabling it makes sense. This is handy and fast in large places; an app could be made to help you navigate Disneyland using only Bluetooth beacons and it would update quickly and use very little battery compared to using GPS. In the United States (and possibly other countries) your phone can make an emergency call to 911 while locked and without a SIM connection to a carrier.
Or read this on Android Central
