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Did you see that they implemented CBR for audio calls and submitted patches to both Signal and WebRTC?

In 2017... CBR has been a thing in secure calling apps for ~5 years now.

Can you recommend some iOS/Android apps which support CBR?

Silent Phone is both Android and iOS compatible, and we have used CBR codecs since we launched (in 2012).

Thanks for the pointer ($10/month), did not know this was available without buying a Blackphone.

Care to name one?

Silent Phone (disclosure: I am an employee)