Hi, I have not faced any issue with using my iPhone4 till now. I have been able to use it quite easily for all phone functions (except message reader). The link-up was without a hitch and the phone book was copied automatically without any problems. In fact this is something I verified in the test car before booking my TJet. If your iPhone has an older version of iOS, updating that may help. Haven't tried playing the music stored in the phone, so I'll not comment on that. I would say that inability to play music from iPhone via bluetooth is a pity.