Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable.
Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.
The account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal.
The current active subscription period cannot be canceled.
You can turn off the auto-renew for the subscription whenever you want to through iTunes account.