I have a similar bluetooth problem. My Go 750 works well with HTC, Nokia and even my old iPhone 4s, BUT, not so with the iPhone 5. I can pair ok, I can dial out ok BUT I can't answer a call, the line just goes dead. My old iPhone 4 with the updated 6 OS even works ok...just not the i5. Apple tells me it's incompatible with the Go750 and the tomtom website sort of indicates that too. Question is, when is tomtom going to release a firmware update to fix this, and whilst there at it, make my go750 auto start when my car starts... just like it used to...