There are a couple of issues with this; none are dealbreakers. 1. As others have mentioned in this thread, people are reluctant to talk to people wearing earph

There are a couple of issues with this; none are dealbreakers. 1. As others have mentioned in this thread, people are reluctant to talk to people wearing earphones. Although perhaps this is less of a problem than the stigma of "hearing aids". 2. Earphones don't usually contain microphones. If you want directionality, the mikes have to be located in or on the ear, not on your phone. Some earphones do contain microphones, and they are the place to start. 3. IOS has pretty low latency in its audio channel, but Android is (or was) terrible. There were so many layers of software in the Android audio path that there was no way to process live sound without so much delay that a hearing aid wearer hearing both live and processed sound together would just hear mush. I read somewhere that Android has fixed this, but I don't know. 4. Bluetooth induces some latency into the live audio path as well. I don't know how much.