How do I cancel my auto-renewing subscription on iOS (Apple)?

Subscriptions purchased through the iPhone or iPad app are managed exclusively by Apple's billing system.

Here's how to cancel your auto-renewal:
Open the Settings app on your iPhone or iPad.
Tap your name / Apple ID (at the very top of the screen).
Tap Subscriptions.
Select the Onoff subscription.
Tap Cancel Subscription and confirm.

⚠️ Please note:
Simply uninstalling the Onoff app, deleting your account or your number from the settings, or porting your number to another carrier does not automatically cancel your Apple subscription. You must follow the steps above to stop future charges.