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On late Monday, AT&T warned visitors on its website of a “data incident” with an ominous banner at the top of the company’s homepage, according to people who visited the page at the time.

“You may be affected by a recent AT&T data incident. Check if your accounts are impacted,” the message said.

The banner linked to a confusing and incomplete FAQ, which also contained a link to a site where users could enter their number to check if they were affected. We tested the tool with one AT&T account and found that it was not

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