Uninstalling Norton app does not automatically stop your subscription. You need to cancel your subscription from the Play Store or App Store or Microsoft Store subscription settings.
To know more about how to cancel or change your subscriptions on App Store or Play Store, refer to the following support articles.
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Apple App Store: https://support.apple.com/HT202039
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Google Play Store: https://support.google.com/googleplay/answer/7018481
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Microsoft Store: https://support.microsoft.com/en-in/help/4000642