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Where are you sourcing those "proper" cell phone radios which don't contain secret binary blobs? I want one too.


You nuke the radio, and use a standalone cell modem. The cell modem may be compromised, but it can't touch the device that's handling encryption.


Speaking of which, where is the flip phone with integrated 4G modem and wifi that can be used as a hotspot?


Why doesn't a cheapest Android smartphone with a 3G modem (say Alcatel 4009D) fit?

Because it's not 4G? Well, here's the real tradeoff: security, comfort, cheapness. Pick two.


Mostly because I believe the device can be more cheaply made if it does not have to run a full-featured OS such as Android. No browser, no color screen, just like my old Nokia candy bar phone; no GPU at all would be required.




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