Should smartphones be banned in K-12 schools nationwide?

I am a mother of two, and I will not apologize for wanting to reach my children during the school day. School shootings and lockdowns are not hypotheticals, they are drills my kids do monthly, and in a real emergency the office line jams while a text gets through. Pew Research has found most parents of teens count the phone's safety benefits as a major reason their child has one, and that instinct does not vanish at the classroom door. A ban also assumes every family has the same safety net, but my neighbor's daughter walks home alone past a busy intersection and texts when she arrives. Schools can restrict use without confiscating the lifeline. My child's safety is not a distraction to be managed.