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The upcoming Librem 5 phone has a hardware killswitch disconnecting the baseband completely. It's not a mInstream device though. Alternatively airplane mode mi

• paavoova 8y ago
  The problem is doing that ensures your mobile device is useless as, well, a real-time communications device. No immediate calls, no SMS, no internet and associated apps without wifi around - how many people are going to enable this? The answer is none, even for the very customers Purism wishes to attract. Because people already wishing to do so can put their phone, any phone, in a Faraday cage, but that seemingly hasn't taken off. Secondly, my concern would be the cellular network automatically flagging you for suspicious activity, especially in an area know to have good coverage. It would certainly look suspect for a device to periodically pop up, send some traffic, then disappear once again.