There is belle emulator in belle Sdk but not sure what is required start it. I remembered try to start it before but result just black screen which I think is window command window. The guy says he wants to run all belle app in emulator which is impossible since the emulator itself is not a complete Os.
Ehm the emulator is a complete OS, it has even more features than a usual Belle 111.30 phone. e.g. like the command line shell, many debug features etc.
Read Symbian OS Internals and a Symbian C++ developers book, it's a full emulator!
That's something else than just a little simulator like the crappy Qt Simulator from Nokia Qt SDK.
I was using it on Windows Vista x32 long time ago, with Win 7 x64 and JDK 8 x64 it doesn't work correctly.