This SmartCitiesWorld trend report examines the emerging trend of Mobility-as-a-Service which brings together various transportation options in a city and allows citizens to plan their route, choose their preferred mode of travel, and book and pay for everything via one app. This network effect will reduce the use of personal automobiles, encourage more sustainable forms of transportation and save  the equivalent of 90 hours travel time per annum per MaaS user.  Pilot trial results are provided. This paper is relevant for urban planners, transportation, technology and business leaders.