[electic]

All the phones are exploited. I doubt it matters.

[supergauntlet]

Really any phone is exploited. When you've got a baseband with direct hardware access that the carrier can connect to there isn't really anything short of fully open hardware that is gonna save you.

[auctiontheory]

If (as claimed) the NSA has hacked the major BIOS/firmware as well as encryption, is there such as thing as "fully open hardware" and would it help?

[zachrose]

To my knowledge no, there is not. If there was, it would also require approval from the network operator. And if you believe that the network operators are aligned with the intelligence community anyways, you would never expect that approval to happen.

[swampboy]

Perhaps, but with a feature phone there's much less for the eavesdroppers to see.

[marveller]

Yes, hence the feature phone :), no GPS, no email, no browsing records, etc.

[parag_c_mehta]

True but phones with highest market share are more susceptible to the phones with least market share.