Wow. Yesterday I installed the newly available Yosemite Beta 4. So, imagine my surprise when I am sitting here and as my iPhone rings, a banner pops up on my iMac desktop telling me that there is a caller (complete with caller ID). I click on the banner and answer the call from my desktop. I carry on a conversation with a friend. It's clear and distinct. This kind of compatibility is one of the big reasons why I switched back to the iPhone from Android. Really enjoying my iPhone 6 Plus and features like these.