This book provides a deeper understanding of the phone-based composing practices of youth and their implications for literacy learning. In the United States, smartphone use among teens is nearly universal, yet many youth who are avid digital composers still struggle with formal schooled literacy. The widespread and rapid embrace of smartphones by youth from all income levels has had a substantial impact on the way that young people approach the act of composing, yet to date, little to no work has explored digital photography and text curation through popular apps like Twitter and Instagram and their impact on literacy, including formal schooled literacy. As more schools are moving to Bring Your Own Device (BYOD) models and lifting classroom bans on cellphones, classroom teachers need information about the affordances of phones for formal literacy learning, which this book provides.