Unauthorized Subscription
Why am I being charged .99?
iPhone 8 Plus, iOS 12
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Best reply
If you mean $0.99, that's the monthly charge for the 50GB level of iCloud storage. Are you sure you haven't purchased that? If you have and want to cancel it please see Downgrade your iCloud storage - Apple Support
Otherwise, this page advises on how to check the situation and provides a link to Support should it be needed:
If you see 'itunes.com/bill' or an unfamiliar charge on your statement - Apple Support