If an app has a subscription associated with it, see -> Delete apps on your iPhone, iPad, and iPod touch -> Delete apps on your iPhone, iPad, and iPod touch - Apple Support
- If you delete an app, it doesn’t cancel in-app subscriptions that you might have. While deleting an app, you might see a Cancel Subscriptions option. Learn how to cancel your subscriptions.
If you don't want to continue a subscription you need always to cancel that subscription in time, see the following Apple articles:
If you want to cancel a subscription from Apple
If you want to cancel a subscription from Apple - Apple Support
If the subscription that you want to cancel is not listed
If the subscription that you want to cancel is not listed – Apple Support (UK)
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See also -> If you are talking about this app, see info from AT&T ActiveArmor Advanced Mobile Security:
- Subscribers pay $3.99/mo. Auto-billed every month through your iTunes account unless canceled. Subscription automatically renews and your account will be charged $3.99 unless auto-renew is turned off at least 24-hours before the end of the current period. To manage your AT&T Active Armor Mobile Security (“Active”) subscription, go to iTunes. Once your Advanced subscription is canceled, you will be downgraded to the basic, free version of the app. To remove the service entirely, you must cancel within the app or via myAT&T, after your iTunes subscription period ends. Payments are nonrefundable (subj. to applicable law).