Nikon D780 DSLR Camera (Body Only) - Manual (Page 449)

403 Network Connections
To connect to the camera from a smartphone or tablet (below,
“smart device”), download the SnapBridge app.
The SnapBridge App
Use the SnapBridge app for wireless connections
between the camera and smart devices.
The SnapBridge app is available free of charge from
the Apple App Store
® and on Google Play ™ . Visit the
Nikon website for the latest SnapBridge news.
Connecting to Smart Devices