Canceling subscription

Re: "My subscription on a certain app won’t let me cancel it

even tho I don’t have the app currently on my phone".

If the subscription is from Apple and is charged for by Apple:

You can manage your subscriptions: learn how to view, change, or cancel them.

If you want to cancel a subscription from Apple - Apple Support

If the subscription is with an app / app developer who charges you directly:

You may be able to cancel the subscription on their website ... or from "support" on the website.

How to contact an app developer - Apple Support

If you didn't get the app from the App Store, learn how to contact a third-party developer.

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Re: "I cannot download that app or any other app without paying back that one certain app owed with money. I don’t know what to do".

What to do: If you can’t download or update apps - Apple Support

or

If a message says 'billing problem with previous purchase' or 'verification required' - Apple Support

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If needed: App Store Support website:

(There is a "Get Support" link (or use the support app) at the bottom of their webpage (link below)

App Store - Official Apple Support

or

Find answers to your questions about purchases, subscriptions, payments, and billing:

Website : Subscriptions and Billing - Official Apple Support