Want to install iOS 15 update from data

I'm glade to help you today

you can install the update by using cellular data by going to the settings > cellular >cellular plans ,and turn off the low data mode and update your phone .

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stay safe!

You can only update using cellular data if you have an iPhone 12 or newer and a 5G data plan.

That's correct. It requires an iPhone 12 or newer and a 5G data plan.