All the payphones in San Francisco, circa sometime before now. Call them by neighborhood, ask whoever answers about the weather, or put a wrench in city-wide spy activity. Ringing phones will show red on the map, and connected calls will turn green.
Text the name of the neighborhood to the app number to be connected with all the payphones in that neighborhood. Neighborhoods are case sensitive.
Please note: this project is sleeping, and the number has been removed. If you have questions or would like to contribute, you can do so, here.