Cell phones in the classroom, do cell phones belong in the classroom?

Cell phones in the classroom, do cell phones belong in the classroom? Much debated topic among students, teachers and parents. What is your opinion on this?
Cellphones a big no from me. Having it in the pocket is different and using it while the class is going on is different.

What is the need for the students to use the cellphone in classrooms. Nothing.

Most of the talking, chit-chatting can be done after class hours and not in classrooms.