You can cancel your subscription or free trial in the iTunes settings at least 24-hours before the end of each current subscription period.
Any unused portion of a free trial period (if offered) will be forfeited when you purchase a premium subscription during the free trial period.
The cancellation will take effect the day after the last day of the current subscription period and you will be downgraded to the free service.
Subscription with a free trial period will automatically renew to a paid subscription.
Subscription payments will be charged to your iTunes account at confirmation of your purchase and upon commencement of each renewal term.
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