With Qt Simulator, you can test Qt applications that are intended for mobile devices in an environment similar to that of the device. You can change the information that the device has about its configuration and environment.
Qt Simulator does not support any device specific APIs by design. Therefore, applications that run well on Qt Simulator also run on any device that hosts the Qt and Qt Mobility libraries. However, this means that you cannot use Qt Simulator to test applications that use device specific libraries, such as Symbian C++ APIs.

Note: Please report bugs and suggestions to the JIRA task tracker.