My iPhone 4 is paired with my 2011 Subaru WRX car stereo via Bluetooth. When it works, it works fine for both music and phone. However, most of the time, when I start the car, the pairing fails. The car says "no device" and iPhone Bluetooth is searching forever. I have "forgotten" and paired more times than I can count, it continues. The only "solution" is to turn off iPhone Bluetooth and turn it on again. The iPhone usually connects quickly after that. Hardly convenient to do every time I get into the car, or while driving.
Now, before you tell me to call Subaru:
1. I did and they say they have numerous reports of iPhone problems;
2. Search the web and you will find numerous reports of this problem with other car brands, and other devices;
3. When I first bought the car, I had a Blackberry and it just worked;
4. I have three other Bluetooth devices paired with the iPhone and they all exhibit this issue to some degree.
So, it's clear that iPhone Bluetooth doesn't work very well. There don't appear to be any apple.com Bluetooth troubleshooting notes for this issue, just notes about headsets. Apple apparently hinted that iOS 4.1 would fix it, but it didn't. I have today's latest version, 4.3.5.
I finally called Apple. After getting past the "your free phone support has ended" by claiming my one year warranty rights, they put me through to iPhone support (800 275 2273). They claimed ignorance of the problem and sent me a document that purportedly was troubleshooting Bluetooth. I was sceptical and with good reason. When the article arrived, it referred to USB and cradle connections.
I'm pretty pi**ed about this and Apple's failing to stand behind their product with a fix, or at least an acknowledgement. It's a great device otherwise but I may go back to a Blackberry.