Hi, You may start from the documents in "doc" directory. For example, ofono-paper.txt would give you an overview of oFono, and you may learn some important concepts as to code, such as atom, driver and plugin. Another doc "overview.txt" would bring you the detailed features oFono had, would have or would never have. Then you may dig into some concrete features that you have most interest in. As you learn more and more about oFono, you may find shining places here and there in the code, and begin to think oFono is a promising project. But for sure, oFono still has gaps comparing with a complete stack, which definitely requires your generous contributions. Good luck! Regards, -Yang