Is the iPhone Simulator UDID unique for each installed instance?

My UDID is reporting as 03B41D62-FB69-5B6D-A95E-473842F4DFE3 from the iPhone Simulator, so it looks like you're correct.

The UDID of the simulator is actually the same as the UDID of your Mac. You can easily verify this by looking at the System Profiler utility (where it is called the Hardware UUID).

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