I've had similar issues mentioned in this thread (on both incoming and outgoing calls) with my Model 3 using an Android (Galaxy S8+). Today I received a call a few minutes into my trip, but it only rang on my phone. While I was on the call, I tapped the Bluetooth icon on the car screen and tapped my phone that was listed on the screen telling it to connect. It then connected and the call transferred over to the car. Nice that it started working during the call, but defeats the purpose of trying to be safe and not take my hands off the wheel and eyes off the road to take a call.