Hello together I drive a Volvo V70 D5 AWD MJ 2006. Is it possible to connect the iPhone 4 to the vehicle in any way (aux, USB, etc.) or are retrofit solutions available? As a radio the HU-850 is built up with 6x CD changer, navigation device RTI and telephone-free intercom (with SIM, not Bluetooth).If I will replace the radio for a double-din radio, which will probably be the easiest solution, Naviagtion RTI and phone still work? Thank you for your information.