taxi app for android, apple and blackberry

Taxi app development. Develop an app to call a taxi cab by the press of a button, the app will automatically locate the gps location of the user and call the nearest taxi cab provider in the radius where the user is located from a taxi cab database. If there is no answer from the taxi cab provider, the app, will call the next nearest provider. The app will be required to be developed for apple, android and blackberry smartphones. The project needs to be completed within 25 days from the date it is granted. It should also be able to handle adverts, have a good graphical interphase that is user friendly. Some of the requirements: App: blackberry, android and apple. Develop the app interphase to be user friendly. Create a database where taxi cab providers can be entered and the app uses that database. Incorporate ad space into the app. Create a site for the app, users can log in and purchase advertisement space.