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To fix this, the easiest way is to log into the AT&T website using your AT&T login credentials. If you are using a different web browser, open a web page that supports iCloud.com. Click on the Sign-in page and use your AT&T login credentials to sign in. Then, select the Profile option on the navigation bar under the My ATT section. Enter your AT&T password and press OK to confirm the deletion. Then, click "Cancel Account" to close your AT&T account.
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