Wi-Fi and cellular are two different ways to interconnect.
Control Center can be used to enable and disable Wi-afi, and enable and disable cellular.
Access Control Center on your iPad - Apple Support
The following image is part of what is shown within Control Center on an iPad…
The red-circled box below shows the network controls.
Circled within that are Wi-Fi (shown set on, in blue) and cellular (shown set off).
In the same circled box, airplane ✈️ mode (not circled) is shown set off, and airplane mode off allows full communications.
Circled in the upper left, the Wi-Fi indicator is showing as connected.