All iTunes and other app subscriptions on your iPhone can be managed in one place in Settings, allowing you to check on or cancel them.
– Go to Settings – Select iTunes & App Store. – Locate and tap your Profile at the top right of the screen.
If you want a little more variety, there's also an iPhone app for checking and canceling your subscriptions. – Go to the App Store
Unless you cancel, most subscriptions automatically renew.
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