Testing services of the implied complexity and breadth is difficult without developing deep infrastructures. Given the timeframe of the project, I decided to develop four experience prototypes for the proposed service instead: SMS Reference, The Cavalry, Body Learning, and Genius Loci. These were selected as they represented one component from each of the free-range mobile device functions, and because their underlying technologies were near-term and fully realizable in 2-3 years development time. They were developed to a point of unsupervised usability and given to subjects to use. Afterwards, users were interviewed about usability and viability issues.