Is it even possible on android? Is there a FOSS dialer to optionally encrypt some phone calls (non voip) using a pre-shared key with other party?
Is it even possible on android? Is there a FOSS dialer to optionally encrypt some phone calls (non voip) using a pre-shared key with other party?
https://en.wikipedia.org/wiki/Acoustic_coupler
Slap your phone in one of those bad boys and go to town with your TST 3550 or whatever.
As for cell phones, I don’t think it’s really supported. I’d recommend using a separate encrypted calling app, or getting a dedicated encrypted phone device.