AT&T — the largest U.S. fiber internet provider — is known for its reliable fiber network offering equal upload and download speeds up to 5,000 Mbps (5 GB).* These fast download speeds make AT&T fiber ...

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AT&T and Xfinity are two of the largest internet providers in the U.S., collectively covering nearly 70% of the country. AT&T is the largest provider of fiber-to-home internet services, whereas ...