If you follow this blog, you know I use Remind101 every day of the week to remind my students about their homework. Simply put it is has greatly improved my students ability to complete homework, but also to communicate with them, especially this year when I had to put up with eleven snow days and ten delayed openings.
Above is a video giving you the highlights and below is one teaching you how to use it. The latest addition to the service is that you can now text an attachment. Of course you can use Tinyurl or Bit.ly to shrink a link to a Google Drive document which is what I often do.