Verizon has told its field technicians in Pennsylvania that they can be fired if they try to fix broken copper phone lines. Instead, employees must try to replace copper lines with a device that connects to Verizon Wireless’s cell phone network.

This directive came in a memo from Verizon to workers on September 20. “Failure to follow this directive may result in disciplinary action up to and including dismissal,” the memo said. It isn’t clear whether this policy has been applied to Verizon workers outside of Pennsylvania.

The memo and other documents were made public by the Communications Workers of America (CWA) union, which asked the Pennsylvania Public Utility Commission to put a stop to the forced copper-to-wireless conversions.