Hi - has anyone been able to use the drop in phone charger with a phone case? When I picked up my car, they told me that my current phone case (iphone 5s) wouldn't work with the drop-in charger. My case is pretty standard - just a rubber grip thingie around the back and edges of the phone. If there are cases that work well with the phone charger cradle, please let me know! Would be nice to get rid of the USB charging cable.