The Tylt Capio ($30) comes with a built-in NFC chip. As a result, you can set up a profile -- to control phone volume or turn on your Bluetooth, for example -- that will automatically be activated when you place your NFC-enabled phone on the mount.
Smartphones attach to the Capio via a patented adhesive. Only silicone and rough materials won’t stick to it; if your case is made out of either, you can use the included support arms. Dust can cause the pad to lose its adhesiveness over time, but rinsing it with water will return it to it original state of stickiness.
The mount’s suction cup will also stick to almost anything, including dashboards, windshields, metal, concrete and painted walls.