Anytone 6666 with the digirig and the FT8 app, works on Samsung S20 Ultra, howver pinout anove is wrong.
Pinout should be pin 3 not 2.
Audio is live from the rear speaker without the mic connected
Anecdotal info: All seems to work better with volume set at 15
Given the proximity to the antenna to the cables, i was getting some RF in i believe, a toroid on the USB from phone to digirig worked.
Lastly, the Y usb cable i have will not deliver power to the digirig or phone - need to find one.
Possible solution to keep phone charged while in use is a proximity charging plate in lieu of plug in.