Simulator to run iOS apps on laptop?

I agree with Ryokuchasan: the only simulator I've heard of is the one bundled with the iOS development tools. This only works with apps you have the source code to because it compiles the iOS app for Intel to run in OS X (using the Simulator window as a screen).

It also has limited multi-touch capability, generally limited to pinch-to-zoom, so you likely won't be able to demo the majority of many apps. (Also, using the mouse to drive an iOS app can be awkward.)

If you want to do consumer testing with iOS apps, you need a physical device in the same room as the test user.

No that's not possible because the iPhone has an ARM processor, while your Mac has an Intel x86 or a i386 processor. To get the application to run on your Mac you need the source code, compile it with Xcode, and run with iOS-Simulator.

But you can remote your iPhone screen from Mac with "Veency" from Cydia and "Chicken of the VNC" a short tutorial on how to do that you can find here: http://www.youtube.com/watch?v=1HPkWysj324