If you are sure, you can select Always Allow to give App Store unfettered access to your data so it will download apps no matter what.

Today, apps are several hundred GBs on average. Step 2: Look at App Downloads setting under Cellular Data - the default setting is to ask for apps over 200 MB. Step 1: Launch Settings and tap App Store There is a setting in the App Store that limits downloads on cellular data to under 200 MB to conserve your data allotment. Unlimited cellular data is still not as commonplace as you might think, can you believe that! Consequently, Apple must be conservative in how it approaches using cellular data so that its users are not in for a shock at the end of the month when they see their data usage bill. Tapping the apps you can see more data about them while swiping left will let you delete them. You will see a list of apps here, with respective storage consumed. Then, you can decide if you want to delete some apps or want to use another strategy to work around this issue. Here's how to check your iPhone's storage usage and find out which apps are using the most. Storage space getting full, or becoming insufficient for the app Store to operate and download apps is the number one reason why iPhone won't download apps any longer. And that's because there is no one answer to it – there are several factors contributing to the problem, any one or a combination of them would result in your iPhone not downloading apps any longer.

There is no straightforward answer as to why, suddenly, your new iPhone 13 won't download apps. Part I: Reasons Why iPhone 13 Won't Download Apps

Iphone 13 apps not downloading