I think we shouldn't have smart phones in class.
Phones are distractions. Phones are distractions because when the Teacher is teaching we will be too busy playing on our phones. Students will steal someones phone. Phones are expensive because They cost a lot of money.
Students cause arguments. Students cause arguments because if you Lost your phone and they have the same phone you will argue over it.
And this is why I strongly believe we should not have smart phones in class.