Auto-renewal: Apple iTunes account will be charged for renewal within 24-hours prior to the end of the current subscription period.
The current free trial will be forfeited when you purchase a subscription to the premium version before the trial period ends.
Manage subscriptions: Users can manage or unsubscribe in iTunes & App Store account management in the phone system settings.
You can go to the Account Settings to cancel the renewal before the trial ends.
Confirm subscription: Payment will be charged to iTunes Account at confirmation of purchase.