Remind101 provides a way for teachers to text message students and stay in touch with parents. Teachers never see students' phone numbers. Students never see theirs.
Upon signing up, teachers create a "class" with a unique number assigned by Remind101. When students and parents send a text to that number, they are subscribed in the class and will begin receiving messages from the teacher via either mobile phones or email. Only one-way messaging is permitted, allowing teachers to send updates and reminders without having to worry about managing another inbox.
Messages can be sent immediately or scheduled for later delivery. It can be used to send students a quick query or challenge problem during the day. Others use it to remind students and parents of upcoming assignments, field trips, report cards, field trips, deadlines, theme days, conferences, and more. A staff group could be set up to announce emergency closures and announcements.
Remind 101 just announced that teachers can now send photos, homework, and presentations to students' and parents' phones. The video demonstrates how to add attachments.