This document discusses how to unleash the power of cellphones in the classroom, even basic "dumbphones" without advanced features. It outlines several ways students can engage with educational content using only cellphones, including using texting, cameras, microphones, and web searching via Google to find definitions, translations, directions, and more. Specific apps and tools are mentioned like Remind 101 for messaging, recording audio to email, blogging, updating Facebook, and uploading videos to YouTube. The overall message is that today's cellphones are powerful tools for student engagement and learning.