The mobile Internet has come to permeate into everyday life. It is expected to accommodate a larger part of the digital economy in the near future. Mobile digital ecosystems have more complicated dynamisms due to the mobile-specific dependencies among their stake-holders. The author presents a framework for mobile digital ecosystems with an entity model, a dynamics model, and an acceptance model. This framework provides a basis for analyzing mobile digital ecosystems. The author identifies the factors that drive mobile digital ecosystems, and presents the challenges and factors that shape these ecosystems from the viewpoint of time dimensional evolution.