New phone needs a new case. It has been this way since the dawn of the smartphone era, and so it shall be until its end. Your HTC EVO 3D is no exception, and for those interested in maximum protection while still maintaining a relatively slim profile, there's nothing like the Otterbox Commuter for HTC EVO 3D.
In typical Commuter fashion, you're looking at two pieces: the flexible, rubbery skin and the hard plastic shell. The rubberized skin fits nice and snug, and the hard shell keeps everything from sliding around.
As far as ports go, the top and bottom bezels on the phone have openings for the microphone and 3.5mm headphone jack, but the left and right bezels are covered up with the rubber skin. The micro-USB port has a removable flap (as it should), but the volume rocker and power button are totally dominated by the rubber skin. The camera shutter button is also protected but the 2D/3D slider is left bare.
As is typical with all EVO 3D cases, the camera lenses are now recessed inside the thickness of the case, so you can lay your phone on its back all you want without worrying about damaging your precious gimmick hardware.