Cancel itunes and App Store subscriptions
There’s an easy way to check and cancel any app, magazine or service subscription you’ve made from itunes or the App Store. You can use this method to cancel subscriptions that renew automatically and to cancel trial subscriptions that will start charging you once they expire.
Open the Settings app, tap ‘itunes & App Store’, your Apple ID at the top, View Apple ID, type your password when prompted, then tap Subscriptions. You’ll see a list of all your subscriptions – select the one you want to cancel, tap Cancel Subscription, then Confirm. At the end of your current billing/free-trial period, itunes will automatically terminate that subscription.