I updated my iPhone 7 Plus to iOS 15.3.1 and the notification won’t go away and I can’t do anything with my iPhone

Hi migrech78,

Re: I can’t do anything with my iPhone

Wondering what the notification is telling you ... does it point to the cause of the problem ?

and'

whether the update was successful, or you received an error message..

and

what you have tried ... eg: turning iPhone off and on ... restart or force restart .... etc.

Might your iPhone be out of storage after the update, so is unable to operate smoothly ?

__________________________________________________________________________

Re: How can I fix this problem ?

See if you spot the cause of the problem, to reveal how to fix it.

Or

Turn iPhone off or on – Apple Support

If that hasn't helped:

Force restart iPhone – Apple Support

OR

Try this article from Apple support

If your iPhone won't turn on or is frozen - Apple Support

If you still need help:

There is a "Get Support" link to Apple at top right on this discussion page.

or

Apple phone numbers around the world

Contact Apple for support and service - Apple Support

All the best :-)