You can send messages to parents and students - whole group or individual basis.  You can send picture messages.  

Messages can be sent to individuals or an entire group.  Parent do have to opt-in to receive messages.

You can email SMS/text messages to parents.  This service does track whether or not they are opened and read by parents.  

Students and parents can sign up to receive text messages on their mobile devices.  You can attach files and create groups.  Formerly know as Remind 101.

Messaging is a new feature added to this digital portfolio service.