Remind - Free
Compatible with iPhone, iPod touch, and iPad. Requires iOS 6.0 or later. This app is optimized for iPhone 5.
Remind101 allows for safe and easy communication between parents, students, and teachers. Students can join a class by sending a text to the teacher, and teachers can text reminders to parents (for up to 10 classes) about important dates, homework assignments, tests, or quizzes. All phone numbers are hidden.