Neither the Audi dealer nor the local Apple store had any idea how to do it, and after reading a lot of different opinions around the web, I was worried that getting an iPhone properly paired with our new Audi A3 was going to be a hassle.
- Turn on Bluetooth.
- Start car.
- Wait for iPhone to find Audi, press button to pair.
- Type in 1234 (yay for obvious defaults!)
- Wait about 30 seconds for Audi to slurp up address book and voila!