While you won't be able to use the simulator to make calls or watch 3D movies on it, it does describe to you how to go about performing certain functions on the phone. The simulator lets users know what needs to be done in order to accomplish something, making sure they won't be lost like a newborn baby when they turn on the phone for the first time.
The HTC EVO 3D is the highly anticipated successor to the HTC EVO 4G on Sprint which makes the phone a big deal to a lot of people. It will come with a 1.2GHz dual-core processor, Android 2.3 (Gingerbread), dual rear 5-megapixel cameras (1080p video in 2D, 720p video in 3D), a 1.3-megapixel front facing camera, a 4.3″ 3D S-LCD display (960 x 540), 1GB of RAM, Bluetooth 3.0, FM radio, HDMI output, microSD card slot (up to 32GB), 4GB internal storage and a 1,730mAh battery. Check out the HTC EVO 3D simulator.
source: Ubergizmo