Free dumb phone is not enough for freedom/privacy.
Lets assume freecalypso-sw reached the goal and produce this phone in the pocket: 1. You still will be tracked by telecom network (exposed location); 2. Your voice will not be encrypted using trusted algorithm (End-to-End) because this is dumbphone as thus will obey badly broken standard GSM A5/1 - A5/3 algos with SIM card's loosy 64bit keys; 3. Your calls/sms'es will travel across telecom network and will easily be accessible for prepared adversary (SS7 hacking); This explain more https://www.youtube.com/watch?v=GeCkO0fWWqc So your data still completely insecure, and you better not to use this phone. Better goal is probably dumb-smartphone at least capable to send traffic over data-connection and able to run free OS/crypto software for end-to-end encrypted communication.
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