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by M95D 753 days ago
It is possible, but it needs to connect to the phone network somehow and GSM chips/modules these days probably run Android inside anyway, so to have a really dumb phone means to have a separate CPU+memory+flash which doubles power usage and doesn't give any assurances that the GSM chip won't do MitM and fsck privacy of the phone anyway.

See: https://hackaday.com/2023/08/03/open-source-cell-phone-based...