Why do need WiFi connection to upload upgrade. Why can't I just use my Internet data connection

CaptainPi1 Said:

"Why do need WiFi connection to upload upgrade. Why can't I just use my Internet data connection"

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Why the Error:

An update cannot be installed via cellular on your device. That is because your device does not have the hardware requirements to do so. As of this reply, that you need is an iPhone 12 with 5G service. Learn More: Use an iPhone 12, that is using 5G in order to update over Cellular - User Tip

To Check for Updates:

Use a Computer and Ethernet:

Start with attempting an update through use of a computer. If you cannot use Wi-Fi, then use Ethernet.  Go Here: Update your iPhone Using a Computer - User Tip. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple

Hello so I better understand your question, are you asking about why you cant use your cellular data to do and update?