iOS 18.4.1 stuck on verifying update, unable to use cellular data

See what to do:

If your computer doesn't recognize your iPhone or iPad - Apple Support

Just a few of thhe suggestions in above article.

Eg: says:

• "On a Windows PC, your connected device should appear in iTunes or the Apple Devices app. For more information, find out about using the Apple Devices app. (You can also use Device Manager to confirm that your computer detects your iPhone or iPad and can connect to it.)"

also says:

"Check your USB cable and connection

• Your iPhone or iPad should chime or vibrate when you connect it to your computer. If it doesn't, unplug the USB cable from your iPhone or iPad and check for debris in your device’s charging port. 
• Connect your device directly to your computer, without using a hub or adapter.
• Try another USB cable. The cable must support both data and charging.
• Try another USB port or computer."

And also:

"Update Windows PC

On your Windows PC, you may also need to update iTunes, update Apple Devices and update drivers.

• Restart iPad
• Restart Windows PC

If nothing here helps :

You may want to open the main article from the link at the top of this reply to see other tips and suggestions near the bottom of the article.

Wondering if Apple Support's online article(s) links below can help:

If you can't update or restore your iPhone or iPod touch - Apple Support

or

As you cannot use cellular data: you may want to try another method:

Update iOS on iPhone - Apple Support

"iOS 18.4.1 stuck on verifying update, unable to use cellular data: Stuck on verifying update for a long time. Cannot use cellular data. Tried restarting and itunes nothing will work."

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How have you Tried iTunes?:

Your iPhone is stuck a Boot Loop. This typically occurs when you go about installing an update, and it stalls while in the process. See my User Tip: How to Fix an iPhone in a Boot Loop - Apple Community

There's generally a way ... you may want to see if trying the suggestions in the reply provided in the discussion thread below can help in your case:

My iPad is stuck in verifying update scre… - Apple Community

It won’t worked for my case because even when I plug in my iPad Pro, the pc won’t even recognize it.

Same problem, my iPad Pro become a very expensive paperweight