Connecting a iPhone 4s to MY2012 RNS

Turn your bluetooth setting on in your iPhone 4S

Turn on the ignition to start your car as this will make the cars bluetooth module discoverable for about 2 minutes.

Wait for the car to appear in your list of available bluetooth connectivity items (something like Audi UHV ????)

Once it does enter the passcode 1234 to connect to the phone (on the iPhone)

Wait for the bongs which let you know it's connected. Click on the left steering wheel button to check your phone book appears in the DIS.

DONE!

As Warren said, remember to have the ignition on. Many a time Ive sat there with just the radio on waiting for my phone to find the bluetooth receiver...