Canon EOS-1D X Mark III Advanced User's Manual page 527

Wi-Fi Connection Without Using Bluetooth
These instructions describe how to establish a direct Wi-Fi connection with a smartphone
and use Camera Connect to control the camera.
Steps on the camera (1)
1.
On the camera, press the <
2.
Select [
3.
Select [Enable].
4.
Select [Connection settings].
: Network settings].
527
> button.