Hi all, I just got a new MDA Compact IV (T-MOBILE) "HTC Touch Diamond" and I've been having problems with contact download since I got the phone..... I just found out that if I put the phone (PDA) in phone mode, the contact download works fine and everything else works as expected. It seems the Mercedes Bluetooth HFP Cradle didn't know how to get to phone mode, thus the failure to download contacts, ringtones and call history. You may want to try this on your 3G IPhones.....make sure you paired your phone with Mercedes Bluetooth HFP Cradle as normal, then press phone on your iphone. (it might take a while depending on the size of your contact list. I only have the 2G iphone, therefore I am unable to test.