If you hear static on a cordless phone, ensure the handset is charged and close to the base, move the base unit away from electronics (routers, microwaves), and replace old batteries. You can also resolve this problem by unplugging all cordless phone connections, including the main phone unit from the wall jack. Wait a few minutes, then plug the main phone into the plug and the wall jack. If this clears the static, plug in remainder of phones. If the problem persists, you may have an issue with inside or outside wiring. Please contact technical support at 513-566-4101 for assistance.