The document lists 20 ideas for using mobile phones in language classrooms. The ideas include using the phone's notes, camera, and recording features to collect language samples, record audio and conversations, and make flashcards. Other ideas involve using text messaging for vocabulary reinforcement and circular writing. Additional suggestions are using social media for tandem learning, keeping blogs, microblogging, language exchanges, distributing materials, playing games, keeping portfolios, and conducting research. The document also notes that teachers should set up activities and consider objectives, skills, and reflection on real-world language use.