In everyday use, I put unfortunately determined that the device does not always work. There comes a call in, music is low and the signal can be heard through the speakers. I press the answer button and nothing happens, the call is then after several failed attempts, unfortunately, gone. Unfortunately, that's now happened already often. So I test again on my doorstep, call myself to the Home phone in the car and it works again. I caught a Monday device? Even after repeated reading the manual I can find no solution.
After Apple i-Phone update everything works fine