Reason 1, because there could be an emergency

Reason 2, in case you don't have a calculator or need an app for work

Reason 3, it could be switched off, and only on when the teachers give permission

I think that phones should be allowed in class, if there's an emergency or parents or sibling are trying to get hold of you for a serious reason I think it's important to get in touch with them and or keep in touch with them if something is happening at home or in family lives.

If your in math class or any class I think it's important to have your phone if you might need to use the calculator or search something up on youtube or listen to music, which could benefit your learning if the class teacher doesn't have a calculator you could use your phone.

However, I think it's important that phones should be on silent in class so it doesn't interrupt the lesson and doesn't interrupt the students learning with all the buzzing and the beeping and the ringing.