iPhone 4 or 5 car vent mount. Modified version of http://www.thingiverse.com/thing:82053
This will fit most 4 or 5 phones with cases, easily scaled to fit.

Printed in PLA on a Makerbot 2. Standard resolution. Supports on.
This will fit most 4 or 5 phones with cases. If you want it without a case you will have to shrink it.