Best printed on its side, this way no supports or raft are needed. I printed this in PLA at medium resolution (10% infill and 2 shells). the honeycomb holes come out perfectly without any supports. Also, I've included the Solidworks part file in case anyone fancied modifying it.
SImple and clean to print!

Will most likely work with other phones too - as the sides are open different screen widths can be accomodated.