Cannot update using Wifi

tamilpriya13 Said:

"Cannot update using Wifi: Hi I am using iPhone XR and iPhone 7 I could not update software from both thru WiFi what’s the issue"

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Try updating it through use of your computer.

Go Here: Update your Device Using your Computer - Apple Support

You must also have 50% battery charge.

Why don't you call your WiFi provider and ask for technical help in solving your issue with your iPhone XR?