Nationwide Mobile banking app no longer available on iPhone

Did you try to download the banking app directly by using the AppStore on your iPhone and the list of your purchases, as explained in this article?

Redownload apps and games from Apple - Apple Support

Excalibr8 wrote:

I had a prompt to update the Nationwide mobile banking app on my iPhone and when I went to the Google store it said it no longer was available. ...

Google store? No, iphones use App Store

There are Nationwide Mobile apps for the iPhone and iPad in the U.S. App Store. From the description, it looks like these are not for a bank, but for an auto insurance company.

A search for Nationwide bank turned up this site in the U.K.

https://www.nationwide.co.uk

This page has links to their mobile apps in the Apple App Store and the Google Play Store.

https://www.nationwide.co.uk/ways-to-bank/banking-app/

If I click on the App Store button, I get an "app currently not available in your country or region" error dialog.

I do not know if this is because Nationwide Bank wants to restrict access to the U.K. only (I'm in the U.S.), or if the absence of the app has to do with trademark reasons. (I.e., the Nationwide insurance company got the name first, and must actively defend against use of the trademark by other companies whose business is similar enough to cause a reasonable chance of confusion.)

Note that if the absence of the app in the U.S. (and in other places outside of the U.K.?!?) is due to trademark reasons – and the insurance company is the one that holds the U.S. trademark – it would be up to your bank to figure out how to fix things in a way that passed legal muster. (Before Apple Computer purchased the trademarks of Apple Records, they had to avoid using the name "Apple" in connection with music. Hence one reason why the iTunes Store was called the iTunes Store and not the "Apple Music" Store.)

It is there on mine in UK

The UK Bank app for Nationwide is working and in App Store so you need to confirm if that is yours.

Yes, it’s a region restriction of the developer.