School officials in St. Ansgar in northeast Iowa are considering buying equipment to jam cell phone signals if they can do so legally.
Earlier this month, the school board passed a motion to spend up to $5,000 to block the phone signals.
Officials say students aren't following rules that prohibit the use of cell phones during school hours.
They noted that use of the jamming equipment would be suspended during emergencies.
Interim superintendent Jim Woodward says the Iowa Association of School Boards is helping research whether it's legal to block the cell phone signals.
A Federal Communications Commission notice issued in 2005 says the sale and use of transmitters that jam cellular or personal communications services is unlawful.