With iphone not fully compatible

I own a iPhone5 and had bought me the SBH50 primarily as a successor to my getting on in years MW600 (including Sony).
The promised features and design have impressed me and I thought it would be better in all respects.
The pairing was smooth and even otherwise, the unit makes a good impression.
The MW600 criticized the volume control via sensor was realized by a small rocker. Excellent.
The clip deserves its name and makes a stable impression.
The line of sight on the display can also be easily tilted as needed, so you can read the display, depending on use. Excellent.
Sound: I only briefly tested, but makes a very good impression.
Music player is easy to navigate and shows song and artist name on. Also super.

Actually, it would have been the perfect machine for me, if it was not so much designed for Android.
The biggest drawback for me: The Action button for answering calls works on iPhone only for answering and hanging up.
One can not call up Siri with how it was still working with the MW600.
View other features like SMS or mails and read aloud function only on Android with corresponding apps. That would not bother me, because you would have had as an assistant Siri.
Therefore, not useful for me, and unfortunately, the only reason why 3 stars. Otherwise, I would have awarded at least 4 or even 5 stars.
However, the device has the possibility of software updates. Whether there will be a solution for it, let's see.
Will the device but that return. Very very bad!