Trying to update to iOS 15.7 but received an error

To update over the air from the phone all of these requirements must be met:

• You need at least 6 GB of free storage
• You must be connected to a Wi-Fi network (and not a personal hotspot) unless it is an iPhone 12 or 13 series or an SE 3rd edition with an active 5G network connection
• The phone must be charged to at least 50%, and preferably plugged in so it stays above 50% during the update
• The phone must not be in Low Power Mode
• The phone must not be connected through VPN, and it may be necessary to delete any VPN apps and VPN profiles
• The phone cannot be in Airplane mode
• You cannot still have a beta version installed on the phone
• You cannot have a previous version that was downloaded, but not installed - go to Settings/General/iPhone Storage to look; if you find an iOS installer, delete it

If you can't meet all of them you can still update using your computer.

Perhaps to try and restart the iPhone, then go into settings;

& disable Automatic updates, then try again.. This may help.

Be sure your iPhone sees a local WiFi and the unit does not

seek to have you wait overnight; with adequate bandwidth

that is not necessary. Otherwise heed the iOS screen advice.

And be wary of the giantly long & detailed Terms of Use.

Was out of town, away from my WiFi & had issues due to

to a lack of bandwidth; on cellular-only, in this instance.