Sorry for the delayed reply - I missed your post, somehow. iOS6, with respect to Bluetooth, particularly on the iPhone 5, has been problematic. There are endless threads on the Apple support site about recent BT incompatibilities, and I have spent countless hours with customers trying to sort out issues on the iPhone 5. On your iPhone 4, I can only suggest deleting the pairings in the phone, power it off then on again. Reset the Sena to factory defaults (press phone button for 12 seconds, red light comes on, press jog dial within 5 seconds. Units powers off, power the Sena back on) and re-pair iPhone to Sena. Aside from that, I don't have any other magic suggestions.