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How to set up a Personal Hotspot on your iPhone or iPad - Apple Support
If Personal Hotspot is not working on your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
Use Instant Hotspot - Apple Support
If an app or feature on your device is not working, it may have been disabled using Screen Time, or by an IT administrator if you are using a device owned by an employer or educational institution. See how to 'Use Screen Time on an iPhone, iPad, or iPod touch' by clicking here --> https://support.apple.com/HT208982