There are certain cases where this might happen all too often. Network issue, not enough space, or apps running the background can all play a role in this issue. Whatever is the issue, we’ll find it and fix it. Just go through the fixes mentioned below.
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You may have faced a weird issue when you try to update or install the iOS app from the App Store. The App icon is greyed out and shows “Waiting”; forever. Now there can be a number of reasons why the app is not downloading, but fortunately, there are ways to fix this. 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.

The problem is not uncommon though. 

Solution #1. Check Your Network and Re-Download the App

First off, if you’re on 3G/LTE, you might want to make sure there aren’t network issues. If you’re on Wifi, check to see if the Wi-fi is stable and doing good. A majority of the problem of apps getting stuck on “Waiting” is mostly because there is no stable data network.

Note: With iOS 11 or later, you can use Cellular Data to download apps which are up to 150MB. If the apps are larger than 150MB, you will have to use Wi-Fi to download them. So, do keep this important threshold in mind. read more article secret calculator app

Once you’ve fixed this, you might still have to re-download the app. Delete the app that is installing (hold on it and when it jiggles, press the “X” button). Reinstall it from the App Store again.

Delete WhatsApp from iPhone

Solution #2. Space on the iPhone

Head over to General → iPhone Storage → and make sure you’ve got enough free space. This isn’t generally the problem but if you save a lot of music, videos and other app data on the iPhone, you might just run into problems when you download an app.

Check iPhone Storage

Also, if the app that’s stuck on “Waiting” shows up on this list, you should tap on it and click on Delete App. This will clear the download and you can re-download the app.

Solution #3. Close Background Apps

The other reason – not proved but suspected – is a lot of apps running in the background. If you’ve got a bunch of them running in the background, this slows down the system quite a bit. To solve this, go to the multitask switcher by double-pressing the home button and then removing all apps that are running in the background.
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Force Quit Apps on iPhone X, Xs, Xs Max, and XR

Once cleared, the iPhone has enough resources to process faster. Try downloading the app now.

What if this still doesn’t solve your problem!?

There are a bunch of things to check:

App Store is experiencing tremendous load: maybe it’s a server issue. Try again after a bit.

iPhone is low on resources. Reboot your iPhone.

Try installing the app via iTunes instead of directly from the iPhone.