Once cleared, the iPhone has enough resources to process faster. Delete the app that is installing (hold on it and when it jiggles, press the “X” button). Once you’ve fixed this, you might still have to re-download the app. Note: Now you can use Cellular Data to download apps that are up to 200MB. A majority of the problem of apps getting stuck on “Waiting” is mostly because there is no stable data network.
If you’re on Wifi, check to see if the Wi-fi is stable and doing good.
Just go through the fixes mentioned below. Whatever is the issue, we’ll find it and fix it. Network issues, not enough space, or apps running the background can all play a role in this issue. There are certain cases where this might happen all too often. This doesn’t happen frequently, but just in case iPhone apps get stuck at “Waiting” when you try to install or update them, there’s really nothing much you can do but to cancel the download and restart it.
Now there can be a number of reasons why the app is not downloading, but fortunately, there are ways to fix this. The App icon is greyed out and shows “Waiting” forever. You may have faced a weird issue when you try to update or install the iOS app from the App Store.
