does anybody know where Nokia (3650) stores the SMS?
I'd like to read such messages - I guess there are not "objects" I can already use for this operation.
Are those messages stored in a Symbian database or is it a structured file? How can I locate it?
The proper method would be to use a Python module that talks to the Messaging Service; However, since that's not available yet, you'll probably have to hack something together by scanning the files in "c:\system\Mail\".
You might want to use something like FExplorer <http://www.gosymbian.com/> to help explore the file system if you don't have a good file browser yet.
At least part of the module will need to be Symbian C++ to hook into the OS API's for the Messaging Service. You basically need a bridge to expose the system API to Python.
If you're a Symbian C++ developer, there should be more examples coming soon on how to do this. Otherwise we'll have to wait for Nokia to release a module for this, and there's no info yet on when that might be.
A full Messaging module should support reading the inbox, sending sms, and receiving sms (ie., event callbacks), so doing it right is a little more complicated then just reading messages. However, these are all native API calls...