Maybe. But if you don't learn anything and score poorly on tests compared to other classes, I don't think the teacher that gives freedom will be very liked. If the teacher can't control the class and student are having "fun" and it's chaos all the time, I still doubt he will get a good evaluation. If texting doesn't really impede on the learning, then why not text. I don't see a big difference between texting and doodling.
I might be too optimistic regarding high-schoolers but I think if it's explained well, they will answer truthfully and the good teachers will still get the best grades.