AT&T High Speed Internet - Enterprise Electronic Self-Servicing AT&T High Speed Internet - Enterprise (HSIA-E) Customer Care Login This provides access to the AT&T High Speed Internet - Enterprise Customer Care features. To continue, you must login by entering your HSIA-E order number and service address phone number that was provided in your AT&T Customer Care welcome letter. Order Number: Phone Number: Should you require further assistance, please call AT&T HSIA-E Customer Care at 877-937-5288.

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