Anyway, I can attach to the holders Various articles for mobile phones and navigation systems, where these provide the four grooves on the back.
And these inexpensive holders here that allows also. Simply unclip and clip on the ventilation holder Smartphone holder to the permanently installed counterpart in the car => everything well ;-)
Who knows old phone holder which "pop up" suddenly after operating the release button is (like me) be surprised: the holding jaws move apart slowly (but fast enough), as long as the release button is pressed. So not a malfunction, but rather a feature ;-)
Get two more ordered me to the test order equal ;-)
