WhatsApp was updating on my phone, but then I got a message so interrupted the update.
WhatsApp then disappeared from my home screen. When I go to WhatsApp in the App Store I am prompted to open, but nothing opens.
How can I get the app back?
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It could be due to the interruption caused during the update process, sometimes it also goes into infinite updating loop. You can try hard resetting your iPhone, this will not delete your content though, follow these steps -
Then try downloading the app again..
In case your iPhone has around 3-4 gb of space left you can try this method, it basically clears the cache data from your storage. Even I perform this once a week, it also helps to free some space. Here are the steps -