Here's a smartphone mount that I made while learning OnShape, and my first original design using OnShape.
The mount includes a bottom opening for the charger cord, earbuds, and built-in speaker; as clear access to the Home button; and a chamfered hole to accommodate a standard wall screw. It is sized to hold an iPhone 6/6S with a Spigen Neo Hybrid case (approx 145x75x10mm) with a little bit of room to spare. I've included an export of the model in STEP & Solidworks formats and can also provide a link to the OnShape cloud location in case anyone would like to customize the design.
Printed upright with an 8mm brim, but no rafts or supports required.