It's easy to sign up for subscriptions and free trials on the iPhone, however, canceling these subscriptions isn't as obvious. Once you know where to look, though, the process is simple.
How to cancel a subscription on your iPhone, iPad, or iPod touch:
Open the Settings app.
Tap on your name.
Tap the subscription that you want to manage.
Tap Cancel Subscription. Note: If you want to cancel Apple One but keep some subscriptions, then tap Choose Individual Services. If you don’t see Cancel, the subscription is already canceled and won't renew.