You can access your subscription information through Manage Subscription in device settings.
This page will tell you when your trial or subscription began as well as include a link to cancel your automatic renewal. For further details about trials and subscriptions through iTunes, please follow the steps below.
Go to phone Settings
Click iTunes & App Store
Click Apple ID at top of screen
Click View Apple ID
Click Subscriptions
Click desired app
View subscription status
Note: If there is a Cancel Subscription button, that means your subscription is active; Otherwise, that means your subscription auto renewal has been already canceled. You can see the renewal date or expired date there.