Not all advertised features available

per:
The coupling is ruckzuck thanks NFC.
Handsfree on the handset works well and is very understandable.
The handset is wonderfully easy.
And do not laugh: It may be necessary also clip it (in the car) to talk to the earlobe.
This then saves a point in Flensburg and about 70 euros fine with fees.

negative:
The designated in the online user guide app smart contact does not exist.
Different Apps are indeed appears compatible with the SBH52 but not work at all and are only for the Smart Watch.
Apps that should work and are also shown in the display of the handset, giving not made the promised notifications, only SMS is displayed.
The Radio application works logically only with infected headset, but unfortunately you can not switch the sound from the headset to the speaker. In addition to this: You can also connect the handset using a cable with an external speaker and has over this a speaker output.
Paired devices can not be deleted individually, there is a Reset required.

All in all I can recommend the part and would buy it again.
One of the main reasons for my purchase was that it has an FM radio, the inexplicably missing my S4.
If one has the S4 in a backpack or bag and listen to radio on the handset or MP3 playback is interrupted with a beep and you can take a phone call.

Oh, I stumbled over something and thinking of a firmware error:
You can also call directly from the call and the caller list. But that's just what indeed makes sense if the screen is unlocked.

In particular, because of the lack of cooperation with the apps and the lack of switchover of the radio on speakers (with connected headphones), I have to reduce my rating to 4 stars.