IPhone and bluetooth hands free, automatic selection?

I have a bluetooth stereo head unit in my car which can be used as a hands free however when I receive a call I have to select the output on the iPhone to get it to come through the speakers thus ruining the point of a hands free. Is there a way I can get the iPhone to automatically select the hands free when it is available? Otherwise I don't get what they are trying to achieve.

Added (1). And how would a photography app (lama app) help?

You could try atooma app or lama app

  • Where did the add playlist selection go? Iv got an iPhone 5. When I 1st got a made a playlist but then deleted it. Now when I go into playlist down the bottom it doesn't show the add playlist button with the plus sign. So I can't make any playlists. I even reset my phone but it didn't come back.
  • Selection of a final year project of computer engineering? I'm a computer engineering final year student. I'm really confused about my final year project. I'm good in programming and i want to do a type of project that has some real worth in market can anyone help me out? I should develop an android app an iPhone or windows 8 app?
  • Selection about iPhone Case, in college? Just pick one choice. Which do you like and which one is more popular in college? How much will you cost on it?
  • Is the Selection of Movies on Netflix Different Between Platforms? I have netflix on my PS4 and on my IPad and IPhone. I find that some shows on my tablet and phone are not available on my PS4. For example IIm watching a show on my tablet called Suits (great show by the way) but when I search for it on my PS4 it says "Titles Related to Suits," The same thing happens with another show called The Americans. Its driving me INSANE. Is it a licensing problem between Sony Netflix and the TV networks?