How do I completely delete an app or game including the data
I need help with my iPhone 7 I have iOS 11 and I don’t know how to completely delet a games data
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When you delete an app, it's data is also deleted from your phone. Some apps, though store your data on their on servers or iCloud so that, should you download the app again and sign back in, your data will be restored.
How to delete apps on your iPhone, iPad, and iPod touch - Apple Support