Tower Collector is a handy tool to help you export data from your phone for OpenCellID and Mozilla Location Services projects. With it, you can upload cell tower locations to help build the OpenCellID and Mozilla Location Services databases. The app is useful to map the extent of your phone's network coverage.

OpenCellID is a worldwide open source project to create a database of cellular towers. It aims to be the most complete, accurate, and up-to-date database of cellular towers in the world. The project is meant to be used for open source purposes such as research or map building.