I don't know what they did, but I used to have connectivity issues with my car, sometimes I had to delete my car and re-sync it, other times I had to toggle bluetooth on/off til it recognized it (2012 Sonata)...not anymore. No issues at all today. Also fixed was my bluetooth streaming issues, which included erroring out the music player and it stopped playing, and I had to pull phone from my pocket to press play or shuffle again...the music would stop and only way to get it going again was by hand. Whatever they did worked, I am still getting used to the UI but so far, the bluetooth update in iOS7 has made me very happy. The music sounds a lot better and clearer too, maybe its just me though.