How many high schools allowed in united states cell phones?

There is no single answer to this question as the policies on cell phone usage in high schools vary from state to state and even from school to school. Some schools may allow cell phones to be used for educational purposes only, while others may ban them altogether. In some cases, students may be allowed to use cell phones during non-instructional times, such as lunch or breaks. It is important to check with the specific school to determine their policy on cell phone usage.