If your school is like mine, you know that kids text ... a lot. By a recent study, they text an average of 60 times per day. This is, not surprisingly, up quite a bit from just a few years ago. I'm amazed at my daughter's finger-speed on the keypad of her slider phone- almost Olympic skills!
Our school has a policy that coaches and teachers do not text players or students. Kids want to text adults but we don't want the opposite in play. We tested out Celly a few years ago but it didn't stick.
I wanted to like Flocknote but found it cumbersome and eventually expensive.
I'm testing out Remind 101 and so far, I'm really impressed. The iOS and Android apps are smooth. The online app has a great UI and overall Remind 101 will be a helpful tool for reminding kids of practice changes, snow day class assignments, etc. We still use our usual cadre of online resources (Google Docs, Moodle, etc.) but sometimes you just need a complement.