Survey the students
Once you've completed your program, it's good to see what the students thought so that you can adjust as necessary.
You could send out a link to a Survey Monkey survey or have students fill out an evaluation in class. You could also hold small focus groups or have a student group give their opinions.
Your evaluation could cover things like: Did you like the messages? What message did you like the most? Which was your least favorite message? Did you use the information in the texts? Did you share the texts with friends? What topics would you like to receive texts on? And, more!