Ameritech Advanced Data Services of Illinois, Inc.

Ameritech Advanced Data Services of Indiana, Inc.

Ameritech Advanced Data Services of Michigan, Inc.

Ameritech Advanced Data Services of Ohio, Inc.

Ameritech Advanced Data Services of Wisconsin, Inc.

Ameritech Mobile Services, Inc.

Ameritech Payphone Services of Ohio, Inc.

Ameritech Payphone Services, Inc.

Ameritech Publishing of Illinois, Inc.

Ameritech Publishing, Inc.

Ameritech Services, Inc.

Ameritech St. Louis Paging Corporation

Ameritech Wireless Holdings, Inc.

Cingular Wireless LLC

Illinois Bell Telephone Company

Indiana Bell Telephone Company, Incorporated

Michigan Bell Telephone Company

Nevada Bell Telephone Company

Pacific Bell Telephone Company

Pacific Bell Directory

Pacific Bell Information Services

Pacific Telesis Group

SBC Advanced Solutions, Inc.

SBC Communications Inc.

SBC DataComm, Inc.

SBC Global Services, Inc.

SBC Internet Services, Inc.

SBC Laboratories, Inc.

SBC Long Distance, Inc.

SBC Services, Inc.

SBC Telecom, Inc.

SBC Teleholdings, Inc.

SNET America, Inc.

SNET Diversified Group, Inc.

SNET Information Services, Inc.

Southern New England Telecommunications Corporation

Southwestern Bell Messaging Services, Inc.

Southwestern Bell Telephone, L.P.

Southwestern Bell Video Services, Inc.

Southwestern Bell Yellow Pages, Inc.

Sterling Commerce, Inc.

The Ohio Bell Telephone Company

The Southern New England Telephone Company

The Woodbury Telephone Company

Wisconsin Bell, Inc.