iPhone hotspot setup
If my iPhone is connected to a wireless internet connection, can I setup a hotspot using that Wi-Fi connection or can I only setup Wi-Fi with the cellular connection from my phone provider?
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Hotspot always originates with a cellular connection.
How to set up a Personal Hotspot on your iPhone or iPad - Apple Support
This may describe what you’re trying to do.
How to share your Wi-Fi password from your iPhone, iPad, or iPod touch - Apple Support