I'm considering buying one of several recent cars that has built-in USB to connect an iPod/iPhone, and control the music from the steering wheel buttons. But some of them lack bluetooth... so what about phone calls? Will an iPhone connected to USB in a car typically play your calls through the speakers? (My current car's iTrip FM solution does not! It works with Siri but not calls.) Mic is not a problem: I already have a dash-mount that puts the iPhone right next to the steering wheel, and people/Siri seem to hear me just fine. Likewise, having a button to answer/hang-up is no biggie: the screen is close to hand. All I need is to be able to hear the call without disconnecting the Lightning-to-USB cord (which of course would enable the iPhone's internal speaker--but that's too quiet for driving anyway). I'm hoping the car's stock USB audio is sufficient and I don't need bluetooth. (AND don't need some third-party accessory.) TIA!