Information
Enabling Wi-Fi Auto-Join for a Wi-Fi network configures the device to remember the network and login information and automatically reconnect to that Wi-Fi network whenever the device is in range. It is recommended that Wi-Fi Auto-Join be turned off for all network connections where security is paramount.
Solution
From the MobileIron console, open the Policies and Configs -> Configuration view. Under the WiFi Policy verify that Auto Join is not checked for any configured SSIDs.