France grants police power to spy on citizens through phones
techradar.com
VPN services and other security tools won't be able to protect people from this kind of state-surveillance. What's next for France's justice reform bill?
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The baseband firmware on your phone has access to all hardware resources and can be modified over the cellular connection without your cooperation or knowledge.
It can't be done by a third party without extreme effort. This requires the cell phone manufacturer to participate along with the cellular service company as well.
Sorry for the late reply but I'd just like to warn you that it doesn't take a lot of effort. It takes some time, some knowledge of programming, electronics and communication protocols and a few hundred $$$ of equipment. DIY cell phone tower