phones in class

Start a program of calling her when she is completely involved is something that interests her?

Based on your brief posting history, it sounds like you could benefit from some local parenting support groups. Have you thought of checking into something like that?

It's probable that this person is not real based on the posting history with not a single reply...and all the questions are leading questions about child-raising.

Cut her off then. I assume you pay for her phone, so cancel the plan temporarily. You can do that - I've done it many times when my daughter went either over the allowed amount of minutes or used it excessively in school.

No discussion needed! Just tell her up front what you're going to do, if she doesn't quit talking during class and then follow through with it.