How I software update on my this iPhone
Software update on my iPhone
iPhone XS Max, iOS 13
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Click or tap on the following blue-text link ➡️ Update your iPhone, iPad, or iPod touch - Apple Support
Wi-Fi is required for iPhone and iPad updates, prior to the availability of 5G connections and devices.
If an update via Wi-Fi is not working, you may need to use a Mac or Windows computer to update your iPhone.