text: You give them some freedom and they are very grateful for that and are going to go by the rules. I believe they would act more respectful and behaved knowing that if they get free time from their teacher for being well behaved they could use their phones. Teachers would also save time in class by not having to confiscate, write up, or tell the student to put their phones away. They would be able to spend their time planning for their class, or maybe even tutoring or helping some one who doesn't understand the lesson. That would help the student and he would finally understand and would make a good grade when taking a test on something to do with that lesson.