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Replicant is the best solution I can think of. It won't solve the problem of
the cell company being able to track you, as they will do this via
triangulation, but at least it will remove the "universal backdoor", and make
it significantly harder for the powers that be to turn the phone into a
"remote listening device".
If this is soely for work purposes, then I suggest only taking it out with
you when you're working, and removing the battery on all other occasions.
Your work movements are unlikely to be secret, anyway, so does it really
matter if the cell company know where you work?
Of course, Replicant isn't perfect (non-free firmware) but it's better than
just running stock Android, or (gasp) iOS!
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