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> Factory-implanted backdoors ruin a commercial relationship -- and could be discovered before deployment

Only if they are discovered.

You can hide the firmware in ways not even the "official" firmware can access and only a mask inspection would show you have a small amount of ROM where none was supposed to be (or twice as much as you state in the chip specs). If I were paranoid, I would be seriously investigating whether such a plan could be actually conducted - how many processes would have to be compromised and how many people would have to be involved to introduce a feature like this in, say, a popular cellphone radio controller. Can we vouch for the integrity of the hardware/software stack in the towers themselves for not having any backdoor/sleeper code or logic?

Again, I don't imagine this as being the work of gangs, but of governments. It's like having your communications blocked as soon as tanks cross the borders and planes start dropping bombs. It's a very nasty scenario.

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