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by another_comment 2010 days ago
>> what would be the most secure way to keep and use a mobile phone?

My opinion: there is no secure way. My initial solution: build a home phone based on a Raspberry Pi 3B+ (with touch screen).

I already built this home phone for myself. It does only voice and SMS/MMS. It only works over Ethernet or Wi-Fi.It uses mains electricity. I wrote the software -it's Python3 and C.

I've been using this phone as my daily driver for the last year. It is very reliable.

I plan to start making it available in Jan 2021. Look for more posts here.