Nothing can be ported UNLESS the source code is available. IF the source code is available, then with enough effort, everything can be ported unless the hardware and operating system just won't allow for it. So yes, Symbian stuff (and all other stuff) can be ported IF it's open source. If not, you have to either reverse engineer it (use various tool to figure out how the compiled code works, and come up with your own code that copies it appropriately), or clone it (meaning, just write your own code from scratch without reverse engineering that does the same things on the surface). Frankly, this applies to all software everywhere.