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https://shop.puri.sm/shop/librem-5-usa ?

$1,999: the cost of telephonic security. Looks good.

Pick a world superpower or megacorp that shares your paranoia, work for them and use their gear. Though it won't be your phone...

I used to but I’m retired. Do you really think it’s paranoia?

In this case I'm thinking in the perspective the mass of average consumers would say someone is thinking. To them a realistic threat model assessment would be 'paranoia' (people are out to get you).

The intent was to use a single word to convey most of a complex intent, without diluting the message trying to express nuance that is better left to the reader to evaluate.

You can’t.

Can you instead verify that each component is uncorrupted, a hardware hash function if you will? Looking at density, centre of gravity, weight, appearance, and/or radiographic imaging?

You'd have to verify the electrons match a specific known-good structure since a targeted attack is likely to simply modify the bits on the components (as in, a custom manufacturer-conspired/factory worker-conspired firmware) instead of swapping the components out.