This chapter illustrates challenges resulting from the everyday use of mobile visualizations in three categories: logistical challenges relating to situated use, privacy challenges involved with potential data disclosures, and ethical challenges surrounding increased access and decreased evidence. In spite of these challenges, introducing visualizations in everyday life can lead to positive experiences viewing and reflecting on data in their natural contexts. Using scenarios to depict use opportunities and challenges, this chapter introduces a set of considerations for designers and researchers looking to develop mobile visualizations for everyday contexts.