Not App Store
The App Store is not on my phone at all?the App Store was there and then it disappeared
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The App Store is not one of the built-in apps that can be deleted. The usual reason for it not being visible is a restriction on purchasing. See: Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support
If that isn't the reason, try using Search to locate it. Use Search on your iPhone, iPad, or iPod touch – Apple Support