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AT&T official phone number

Find the official AT&T phone number listed for Existing-customer general, billing, and technical support. Confirm the company's source page before sharing information or starting a call.

Public U.S. number listed on the source

1-800-288-2020

This number was visible on the linked official source when it was checked on October 17, 2026. Phone numbers and departments can change, so use the source link below to confirm it before calling. A source check cannot establish who is calling you.

Open AT&T official source

Source and department details

Department or route: Existing-customer general, billing, and technical support
Source checked: October 17, 2026
Latest listing review: October 17, 2026 — phone confirmed on the official source.

Evidence from the official source

Existing Customers — 800-288-2020. Billing FAQ: “Prefer to speak with someone? Call us at” 800-288-2020.

Existing-customer billing and technical support; new customers use a separate number.

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