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Here’s a 2014 article titled “How the NSA can ‘turn on’ your phone remotely”
http://money.cnn.com/2014/06/06/technology/security/nsa-turn-on-phone/index.html

Around 2002 the FCC required all cell phones to have GPS tracking and I imagine it wasn’t for nice reasons.

Some apps intrude on your privacy.
Here’s a website that assigns a privacy grade to apps.

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Oh and then key loggers and cell phone hacking: Top Companies Hacking Your Computers/Phones