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While in Settings -> General -> iPhone Storage, check to see if the update has already downloaded. If you have more than 1 GB (gigabyte) available, then you have enough storage space to update your iPhone.
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Check out our other article if your iPhone is experiencing Wi-Fi issues. Make sure the switch next to Wi-Fi is on, and that a checkmark appears next to the name of your Wi-Fi network. We recommend using Wi-Fi instead of cellular data when downloading updates, as it’s faster and won’t eat into your data plan.
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Some updates, because they are so large, require a Wi-Fi connection. Your iPhone needs an internet connection to download new iOS updates. Make Sure Your iPhone Has An Internet Connection
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