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AT&T Customer Service
If you have a problem with your phone or service, you can call the customer service number on the back of your service card. You can also call 1-800-822-4357. If you're calling from outside the U.S., you'll need to dial the international number first.
For more information, see How to Call the International Number on Your Service Card.
United State Of America
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By adding your e-mail address, you can track the phone number 800-756-0134.