An interface for a one-button cab service app. The application takes the current location of the user from the phone’s gps, and when the user presses the call button, a message is sent to the cab company with the location, a message is then returned with estimated time until the cab arrives. Everything is integrated in the app – the location, the number of the company and the message sending, all the user has to do is go somewhere and press the “call-a-cab” button.