You have to special tool (plastic wedges) used to create a gap for inserting allow. Only works with a lot of power. Could leave when dismounting permanently in the dashboard "Quetschspuren". Budge it. All thing for smartphones very small, since each additional mounting fehlt.Man additionally required so an adapter for the mobile phone. Very close to the steering wheel, may interfere with large smartphones. If you still mounted the Hama Navi-holder in the middle on the switch for the hazard warning lights, everything is very close, including the "cable salad" (current phone and Navi plus antenna TMC). One should therefore consider carefully whether that is ideal for your needs.
