student be allowed to have cell phones in elementary and high school

who do not have a cell phone these days,it have been important part of our lives.many people think that cell phone should not permitted for school going students.they think that it can be distracted the student or it can be create disturbance in the classroom.
but according to my opinion having cell phone like smart phone is very important tool for the students in up coming days.
Because due to smart phone students are able to connect with their families and friends.Smart phone can be help full in research using calculator and one more important think that it make responsible adult due to this technology. cell phone helps the students when there is dangerous issue.with the progressive technology there is no life without the use of technology.now teachers gave them online assignments .and there is no deal whenever teachers are going to held test they can pick the cell phone and keep it in front of table until finish the test.
So i think is is very important for educational purpose and for this teachers should promote the way of using cell phone did not make it permitted for the students in classroom