To manage subscriptions on an iOS 11 or later device, please consult the corresponding article of Apple knowledge base.
If you are using a device with iOS 10 or earlier operational system, you can manage subscriptions (disable or enable) by clickyng on this link from your mobile device.
If something went wrong with the link above, please do the following:
- On your mobile device launch the App Store application.
- Tap your Apple ID icon at the right upper corner of the screen.
- Tap Subscriptions.
- Choose the subscription that you want to manage..
- Tap Cancel Subscription. If you don’t see Cancel Subscription, the subscription is already canceled and won't renew.
More information on how to turn off automatic renewal could be found in the following article at Apple support website.