I can’t update my iPhone

Well, I see at least 3 problems:

• Your battery must be above 50%, and preferably plugged in so it stays about 50%
• Your phone cannot be in low power mode, which it is right now
• You are connected to a personal hotspot, and not a Wi-Fi network

Once you correct these 3 problems it should resume. Here is the full list of update requirements:

• You need at least 10 GB of free storage for iOS 16 or 6 GB for iOS 15 or lower; more is better
• You must be connected to a Wi-Fi network (and not a personal hotspot) unless it is an iPhone that supports cellular 5G (12, 13, 14 or SE 3rd edition) and has a 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.

Charge the battery.

Connect to a WiFi network.

Attempt the update again.

NOTE: Repeatedly depleting the battery to low levels may lead to premature battery degradation.