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Click the Manage tab/option in the +Play marketplace. This loads the Manage area of +Play where you'll be able to see all of your active subscriptions
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Click the Manage button on your HISTORY Vault subscription.
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Scroll down to the active plan & click the green toggle switch with the word "On" written on it. A confirmation message will load.
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Click the 'Yes, Unsubscribe' button to complete cancellation.