Unfortunately I can not activate the voice control on the iPhone with the headset

Application: The mobile phone is somewhere in a bag and I go by car. I want to call someone, to put on the headset and start the voice recognition of your phone. This selects the voice of my name. So I can fully concentrate on driving me even when dialing.

In all headsets that I had previously, you could start the voice recognition of iPohnes by briefly pressing or pressing a button on the headset. This I can not do it. This headset itself has a speech recognition. Sometimes it understands the command "Phone command" (I think that's his name, I've already returniert headset), but then nothing does.

The speech recognition headset can save the manufacturer because it works very badly. I speak clearly and High German. Mostly it goes Pair devices, no matter what I say (eg battery). As a result, I take it off, close (= off), then open it again and must wait.

If the voice-activated phone calls work with my iPhone 5, and the manufacturer had left out the voice control of the headset, I would give 5 stars.