Cellphones unfortunately are not compatible with privacy. A laptop connected to the internet via WiFi is the only secure mobile option. Even with an open source GSM FPGA, you would be limited to 2G, and you probably want 4G.
The option just doesn’t exist.
Librem 5 is the closest option, but still the cell companies will sell your location.
The option just doesn’t exist.
Librem 5 is the closest option, but still the cell companies will sell your location.