Hmm, I hadn't thought of that. I frequently pull my ip4s out of my pocket when driving. :hmm:
I love my Mountek nGroove Snap car dock. It comes with little plates that stick to the magnetic mount. It works perfectly and I don't have to keep my phone in my pocket while I drive.
You can adhere one of the metal plates to your phone or case. Instead, I just sandwich the plate inside the phone's case. For other phones, you can put the plate under the battery cover. For iPhones, you don't have to worry about covering the antennas because they're all at the top and bottom. Some Samsung phones have NFC in the battery compartment, so you'd probably have to worry about blocking that.
This: [
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You can mount it in a CD slot (who needs that when you have a smartphone?) or wedge it into a dashboard seam. That's how I mounted it in my cheap Chevrolet Aveo. With Bluetooth, the iPhone 6 Plus makes a killer music / GPS system.
FYI: The newer version of the mount doesn't have that ugly yellow sticker. I bought one for my friend as a birthday gift and it was black with the "M" logo.