Modul simulation

Is there any tool with which you can make simulation before you make modul programming ? Im asking this becuse i want to make some simulation/tests before i get wavecom modul.

This question is similar to this:

http://www.wavecom.com/modules/movie/scenes/forums/viewtopic.php?t=816

And my answer is the same: I am pretty sure there is no such thing.

Best Regards,
Jan