The Autrey Mill Nature Preserve and Heritage Center in Johns Creek has launched cell phone tours of the 43-acre site. Visitors can dial a phone number and enter a site code to hear information about the preserve and its historic buildings. Recordings provide information on the history of the buildings, including their previous residents and interesting features that distinguish each building.

The service was created through a $3,000 grant from Sawnee EMC.

Information: www.autreymill.org.