wi fi or mobile

[winnette]

How do I know if I am using a wifi connection and not mobile data?

 

[Jennifer Stough]

When using WiFi, the mobile data icon or 4g icon with up and down arrows should not be visible. You would see only the WiFi icon, or, the stacked arches. Some devices show both signals. In that case I assume one would be greyed out and the other solid.