Using my hot spot on iPhone is it considered WiFi how do I join my hot spot
How to connect my new iPad mini to hotspot on iPhone
iPad Mini 5, iPadOS 14
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See >>> How to set up a Personal Hotspot on your iPhone or iPad – Apple Support
This article from iMore provides an excellent description of joining your iPhone hotspot from iPad:
https://www.imore.com/how-to-tether-ipad-wi-fi-iphone-personal-hotspot