This project is completely open source, you can download the source code for the Android App, and import it into your eclipse workspace. All we ask is that you tell us who you are and what you plan to do with the code before downloading it. You can then use the code freely, without any license restrictions, although we'd love it if you can give us credit in your final product.
How this App works, is it detects nearby cell towers, and compares the cell id, MCC, MNC and LAC codes against a SQLLite database of over 2 million known cell towers worldwide. It is designed to give you the best answer it can, although, the data is not exhaustive. This data will never be as accurate as GPS or Online Geolocation, but it serves as a good failover, whenever an Internet connection is unavailable.
If you would like to discuss a project with us, please send an email!