ILLINOIS BELL TELEPHONE CO
10-K, 1994-03-30
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                              -------------------
 
                                   FORM 10-K
 
                                  ------------
 
           /X/  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF
                THE SECURITIES EXCHANGE ACT OF 1934 [FEE REQUIRED]
                    FOR THE FISCAL YEAR ENDED DECEMBER 31, 1993
 
                                       OR
 
         / /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF
                       THE SECURITIES EXCHANGE ACT OF 1934
 
                         COMMISSION FILE NUMBER 1-2222
 
                        ILLINOIS BELL TELEPHONE COMPANY
 
<TABLE>
<S>                                            <C>
           AN ILLINOIS CORPORATION                             IRS EMPLOYER
                                                              NO. 36-1253600
</TABLE>
 
               225 WEST RANDOLPH STREET, CHICAGO, ILLINOIS 60606
                         TELEPHONE NUMBER 312 727-9411
 
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SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:
                           (SEE ATTACHED SCHEDULE A)
 
SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:
                                     NONE.
 
    THE  REGISTRANT, A  WHOLLY-OWNED SUBSIDIARY OF  AMERITECH CORPORATION, MEETS
THE CONDITIONS SET FORTH IN GENERAL INSTRUCTION J(1)(A) AND (B) OF FORM 10-K AND
IS THEREFORE FILING THIS FORM WITH REDUCED DISCLOSURE FORMAT PURSUANT TO GENERAL
INSTRUCTION J(2).
 
    INDICATE BY CHECK  MARK WHETHER  THE REGISTRANT  (1) HAS  FILED ALL  REPORTS
REQUIRED  TO BE FILED BY  SECTION 13 OR 15(D) OF  THE SECURITIES EXCHANGE ACT OF
1934 DURING  THE  PRECEDING 12  MONTHS  (OR FOR  SUCH  SHORTER PERIOD  THAT  THE
REGISTRANT  WAS REQUIRED TO FILE SUCH REPORTS), AND (2) HAS BEEN SUBJECT TO SUCH
FILING REQUIREMENTS FOR THE PAST 90 DAYS.  YES __X__  NO ______
 
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<PAGE>
                                   SCHEDULE A
 
SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:
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<TABLE>
<CAPTION>
                                                                        NAME OF EACH EXCHANGE
                       TITLE OF EACH CLASS                               ON WHICH REGISTERED
<S>                                                                <C>
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THIRTY-FIVE YEAR 7 5/8% FIRST MORTGAGE BONDS, SERIES K,
  DUE APRIL 1, 2006                                                    NEW YORK STOCK EXCHANGE
THIRTY-ONE YEAR 7 1/4% DEBENTURES, DUE MARCH 15, 2024                  MIDWEST STOCK EXCHANGE
</TABLE>
 
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<PAGE>
                               TABLE OF CONTENTS
                                     PART I
                                  DESCRIPTION
 
<TABLE>
<CAPTION>
ITEM                                                                           PAGE
- ----                                                                           ----
<S> <C>                                                                        <C>
1.  Business...................................................................   1
2.  Properties.................................................................   8
3.  Legal Proceedings..........................................................   9
4.  Submission of Matters to a Vote of Security Holders (Omitted pursuant to
      General Instruction J(2)).
</TABLE>
 
                                    PART II
                                  DESCRIPTION
 
<TABLE>
<S> <C>                                                                        <C>
5.  Market for Registrant's Common Equity and Related Stockholder Matters
      (Inapplicable).
6.  Selected Financial and Operating Data......................................  10
7.  Management's Discussion and Analysis of Results of Operations (Abbreviated
      pursuant to General Instruction J(2))....................................  11
8.  Financial Statements and Supplementary Data................................  16
9.  Changes in and Disagreements with Accountants on Accounting and Financial
      Disclosure...............................................................  32
</TABLE>
 
                                    PART III
                                  DESCRIPTION
 
<TABLE>
<S> <C>                                                                        <C>
10. Directors and Executive Officers of Registrant (Omitted pursuant to General
      Instruction J(2)).
11. Executive Compensation (Omitted pursuant to General Instruction J(2)).
12. Security Ownership of Certain Beneficial Owners and Management (Omitted
      pursuant to General Instruction J(2)).
13. Certain Relationships and Related Transactions (Omitted pursuant to General
      Instruction J(2)).
</TABLE>
 
                                    PART IV
                                  DESCRIPTION
 
<TABLE>
<S> <C>                                                                        <C>
14. Exhibits, Financial Statement Schedules and Reports on Form 8-K............  32
</TABLE>
 
                                       i
<PAGE>
                                     PART I
 
ITEM 1. BUSINESS.
 
GENERAL
 
    Illinois  Bell Telephone Company  ("the Company") is  incorporated under the
laws of the State of Illinois and has its principal office at 225 West  Randolph
Street,  Chicago, Illinois 60606 (telephone number 312-727-9411). The Company is
a wholly-owned  subsidiary of  Ameritech Corporation  ("Ameritech"), a  Delaware
corporation.  Ameritech is  the parent  of the  Company, Indiana  Bell Telephone
Company, Incorporated, Michigan Bell Telephone Company, The Ohio Bell  Telephone
Company  and Wisconsin Bell, Inc. (the  "landline telephone companies"), as well
as several  other communications  businesses, and  has its  principal  executive
offices  at 30  South Wacker  Drive, Chicago,  Illinois 60606  (telephone number
312-750-5000). The Company  is managed  by its  sole shareholder  rather than  a
Board of Directors as permitted by Illinois law.
 
    In  1993, Ameritech  restructured its  landline telephone  companies and two
other related businesses  into a structure  of customer-specific business  units
supported  by a single,  regionally coordinated network  unit. The five landline
companies continue to function as legal entities, owning Bell company assets  in
each  state and continue to be regulated  by the individual state public utility
commissions. Products and services are now marketed under a single common  brand
identity,  "Ameritech," rather than  using the "Bell"  name. While the Ameritech
logo is  now  used to  identify  all the  Ameritech  companies, the  Company  is
sometimes regionally identified as Ameritech Illinois.
 
    The  Company is  engaged in  the business  of furnishing  a wide  variety of
advanced telecommunications services in  Illinois, including local exchange  and
toll  service and network access services. In accordance with the Consent Decree
and resulting Plan of Reorganization ("Plan")  described on page 2, the  Company
provides  two  basic  types  of  telecommunications  services  within  specified
geographical areas termed Local Access and Transport Areas ("LATAs"), which  are
generally  centered on a  city or other identifiable  community of interest. The
first of  these  services  is the  transporting  of  telecommunications  traffic
between telephones and other equipment on customers' premises located within the
same LATA ("intraLATA service"), which can include toll service as well as local
service.  The second service is providing exchange access service, which links a
customer's  telephone  or  other  equipment  to  the  network  of   transmission
facilities  of interexchange  carriers which  provide telecommunications service
between LATAs ("interLATA service").
 
    About 80% of the population and 20% of the area of Illinois is served by the
Company. The remainder of the state is served by other local  telecommunications
companies.  Other communications  services offered  by the  Company include data
transmission, transmission of  radio and  television programs  and private  line
voice and data services.
 
    The  following table sets forth for the Company the number of customer lines
in service at the end of each year.
 
<TABLE>
<CAPTION>
                                                                              THOUSANDS
                                                        -----------------------------------------------------
                                                          1993       1992       1991       1990       1989
                                                        ---------  ---------  ---------  ---------  ---------
<S>                                                     <C>        <C>        <C>        <C>        <C>
Customer Lines in Service.............................      5,763      5,586      5,460      5,360      5,232
</TABLE>
 
    The Company has an agreement with: Ameritech Publishing, Inc., an  Ameritech
business  unit  doing business  as  "Ameritech Advertising  Services"; Ameritech
Publishing of Illinois,  Inc. ("API-IL");  The Reuben  H. Donnelley  Corporation
("Donnelley"); and AM-DON, a partnership between Donnelley and API-IL. Effective
January  1,  1991, the  obligations of  the individual  parties with  respect to
publication of classified  directories were assigned  to the partnership,  which
does  business as DonTech.  Under this agreement,  DonTech publishes, prints and
delivers classified directories and the Company provides listings to DonTech and
performs the billing and collection services for the directories as an agent for
the  partnership.  In  consideration  for   the  operations  performed  by   the
 
                                       1
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Company, the partnership pays it a guaranteed amount each year plus an increment
for  growth  and  reimburses  the  Company for  various  expenses  it  incurs in
connection with its publication of alphabetical directories.
 
    Ameritech Services, Inc. ("ASI") is a  company jointly owned by the  Company
and  the other  Ameritech landline  telephone companies.  ASI provides  to those
companies human resources,  technical, marketing, regulatory  planning and  real
estate asset management services, purchasing and material management support, as
well  as labor  contract bargaining  oversight and  coordination. ASI  acts as a
shared resource for the Ameritech subsidiaries providing operational support for
the landline telephone companies  and integrated communications and  information
systems for all the business units.
 
    Ameritech  Information  Systems,  Inc., a  subsidiary  of  Ameritech, sells,
installs and maintains  business customer premises  equipment and sells  network
and  central office-based  services provided by  the Company and  the other four
landline telephone  companies.  It  also provides  expanded  marketing,  product
support  and  technical  design resources  to  large business  customers  in the
Ameritech region.
 
    In 1993, about 91% of the total operating revenues of the Company were  from
telecommunications  services  and  the remainder  principally  from  billing and
collection  services,  rents,  directory  advertising  and  other  miscellaneous
nonregulated  operations. About 74% of the revenues from communications services
were attributable to intrastate operations.
 
  CAPITAL EXPENDITURES
 
    Capital expenditures represent the single largest use of Company funds.  The
Company  has  been  making  and  expects  to  continue  to  make  large  capital
expenditures to meet the demand  for telecommunications services and to  further
improve   such  services.  The  total  investment  in  telecommunications  plant
increased  from   about  $7,036,000,000   at  December   31,  1988,   to   about
$8,224,000,000  at December  31, 1993,  after giving  effect to  retirements but
before deducting accumulated depreciation  at either date. Capital  expenditures
of the Company since January 1, 1989 were approximately as follows:
 
<TABLE>
<S>                        <C>            <C>                        <C>
    1989.................   $588,000,000  1992.....................   $579,000,000
    1990.................   $549,000,000  1993.....................   $537,000,000
    1991.................   $565,000,000
</TABLE>
 
    Expanding  on the  aggressive deployment plan  it began in  1992, in January
1994, Ameritech unveiled a  multi-billion dollar plan for  a digital network  to
deliver  video services. Ameritech is launching  a digital video network upgrade
that by the end of the decade will enable six million customers in its region to
access  interactive  information   and  entertainment  services,   as  well   as
traditional cable TV services, from their homes, schools, offices, libraries and
hospitals.  The Company, for its part in the network upgrade has made an initial
filing with the Federal Communications Commission ("FCC") seeking approval
of the program. The filing reflects capital expenditures of approximately
$160,000,000 over the next three years.
 
    The Company may  also, depending  on market demand  make additional  capital
expenditures  under  the  digital  video network  upgrade  program.  The Company
anticipates that its capital expenditures for the program will be funded without
increasing  its  recent  historical  level  of  capital  expenditures.   Capital
expenditures are expected to be about $441,000,000 in 1994. This amount excludes
any  capital expenditures that may occur in  1994 related to the above described
video network upgrade program.
 
CONSENT DECREE AND LINE OF BUSINESS RESTRICTIONS
 
    On August 24,  1982, the United  States District Court  for the District  of
Columbia   ("Court")  approved  and  entered   a  consent  decree  entitled  the
"Modification  of  Final  Judgment"  ("Consent  Decree"),  which  arose  out  of
antitrust  litigation brought  by the Department  of Justice  ("DOJ"), and which
required American Telephone and Telegraph  Company ("AT&T") to divest itself  of
ownership
 
                                       2
<PAGE>
of  those  portions of  its wholly-owned  Bell operating  communications company
subsidiaries ("Bell  Companies") that  related to  exchange  telecommunications,
exchange  access and printed  directory advertising, as  well as AT&T's cellular
mobile communications business. On August 5, 1983, the Court approved a Plan  of
Reorganization ("Plan") outlining the method by which AT&T would comply with the
Consent  Decree. Pursuant to the Consent  Decree and the Plan, effective January
1, 1984, AT&T divested itself of, by transferring to Ameritech, one of the seven
regional holding companies ("RHCs") resulting from divestiture, its ownership of
the  exchange  telecommunications,   exchange  access   and  printed   directory
advertising  portions of the Ameritech landline  telephone companies, as well as
its regional cellular mobile communications business.
 
    The Consent Decree, as  originally approved by the  Court in 1982,  provided
that  the Company (as well  as the other Bell  Companies) could not, directly or
through an affiliated enterprise, provide interLATA telecommunications  services
or  information services, manufacture or  provide telecommunications products or
provide any product or service, except exchange telecommunications and  exchange
access  service, that  is not a  natural monopoly service  actually regulated by
tariff. The Consent Decree allowed the  Company and the other Bell Companies  to
provide  printed  directory advertising  and  to provide,  but  not manufacture,
customer premises equipment.
 
    The Consent Decree provided that  the Court could grant  a waiver to a  Bell
Company  or  its  affiliates  upon a  showing  to  the Court  that  there  is no
substantial possibility that the  Bell Company could use  its monopoly power  to
impede  competition in the market it seeks to enter. The Court has, from time to
time, granted  waivers to  the Company  and other  Bell Companies  to engage  in
various activities.
 
    The Court's order approving the Consent Decree provided for periodic reviews
of  the restrictions  imposed by  it. Following  the first  triennial review, in
decisions handed down in September 1987 and March 1988, the Court continued  the
prohibitions  against Bell Company  manufacturing of telecommunications products
and provision of interLATA  services. The rulings  allowed limited provision  of
information services by transmission of information and provision of information
gateways,  but excluded  generation or  manipulation of  information content. In
addition,  the  rulings  eliminated  the  need  for  a  waiver  for  entry  into
non-telephone related businesses.
 
    In  April  1990,  a  Federal appeals  court  decision  affirmed  the Court's
decision continuing  the  restriction  on  Bell  Company  entry  into  interLATA
services  and the manufacture of  telecommunications equipment, but directed the
Court to review its  ruling that restricted RHC  involvement in the  information
services  business and to determine whether  removal of the information services
restriction would be in the public interest. In July 1991, the Court lifted  the
information  services ban but stayed the  effect of the decision pending outcome
of the appeals process. Soon  after, the stay was lifted  on appeal and in  July
1993,  the U.S. Court  of Appeals unanimously upheld  the Court's order allowing
the Bell Companies to produce and  package information for sale across  business
and  home phone  lines. In  November 1993,  the U.S.  Supreme Court  declined to
review the lower court ruling.
 
    Members of Congress and  the White House are  intensifying efforts to  enact
legislative  reform  of  telecommunications  policy in  order  to  stimulate the
development of  a  modern  national  information  infrastructure  to  bring  the
benefits  of advanced  communications and  information services  to the American
people.
 
INTRASTATE RATES AND REGULATION
 
    The Company, in providing communications services, is subject to  regulation
by the Illinois Commerce Commission ("ICC") with respect to intrastate rates and
services,  depreciation rates (for intrastate  services), issuance of securities
and other matters.  Unless otherwise indicated,  the amounts of  the changes  in
revenues resulting from changes in intrastate rates referred to below are stated
on  an annual basis and are  estimates without adjustment for subsequent changes
in volumes of business.
 
    The principal changes in intrastate rates authorized since January 1,  1989,
were net decreases of $15,050,000 in 1989 and $49,567,000 in 1990, net increases
of $3,522,000 in 1991 and net decreases of $2,593,000 and $6,023,000 in 1992 and
1993,    respectively.    The    decreases   in    1989    included   $3,087,000
 
                                       3
<PAGE>
in one-time credits and  $15,125,000 in on-going rate  reductions relating to  a
true-up associated with the detariffing of building cable. A decrease in 1990 of
$48,433,000  was due to  on-going rate reductions stemming  from the November 9,
1989 Rate Case Order. Rate decreases  in 1991 included a $6,929,000 decrease
in business  usage rates  due to increases  in volume discounts.
The business rate decrease partially offset a $7,438,000 increase in
residence network access line  charges that  was part of the  1989 rate case.
In 1992, the Company reduced public coin rates by $1,752,000 to reflect the
replacement of municipal message taxes  with excise  taxes and  decreased
digital private  line services  by $1,800,000. Rate decreases in  1993
included  a $1,000,000  decrease due  to the  restructure  of
Optinet  Service,  a  decrease  of  $4,000,000  due  to  the  switched transport
restructure and a decrease of $2,200,000 due to the restructure of IntraMSA 800
nondedicated service.
 
    In  1988, the  Company entered into  negotiations with  the Commission staff
that resulted  in an  agreement  for temporary  rate reductions  of  $85,000,000
annually  to reflect  the effect of  the Tax  Reform Act of  1986. The Company's
proposal for a  permanent rate reduction  of $35,000,000 annually  was filed  on
December  13, 1988. Included in this plan  were several proposals to bring rates
into closer alignment with costs, i.e., increases for most residence  customers'
monthly access line charges, modification of the "pay-per-call" rate plan in the
Chicago Market Service Area ("MSA") and extension of that plan to other MSAs and
elimination  or reduction of  some subsidies to  residence customers by business
customers. This plan also included introduction of an incentive regulation plan.
 
    The ICC issued an order November 9, 1989 requiring the Company to reduce its
rates by $45,383,000, in addition  to the $85,000,000 temporary rate  reduction,
which  was made permanent.  The Commission approved  the structural rate changes
proposed by the Company,  including the Company's plan  to expand its  mandatory
usage-sensitive  service  throughout  most  of the  state,  to  increase monthly
residence access line charges over a three year period, to increase usage volume
discounts and  to  reduce  business  rates for  touch-tone  and  custom  calling
services.  The ICC also approved a modified regulatory structure in place of the
incentive regulation plan  proposed by  the Company. Under  this structure,  the
Company's  rates were set to produce earnings  at a 12.76% return on equity with
earnings above that level shared with customers via refunds.
 
    The ICC's rate order  was appealed to the  Appellate Court of Illinois.  The
Court   overturned  the  modified  regulatory  plan  on  the  grounds  that  the
earnings-sharing provisions of the plan constituted retroactive ratemaking.  The
prescribed  rate of return,  because it was inextricably  linked to the modified
regulatory plan,  was  also  reversed.  In  addition,  the  Court  directed  the
Commission  to arrive at a service cost methodology which apportions the cost of
common expenses among competitive and noncompetitive services. These issues were
remanded to the Commission on December 5, 1990.
 
    The ICC issued a new Order on Remand on November 4, 1991 that eliminated the
modified regulatory plan and established a fixed authorized return on equity  of
13.1%.  The  ICC also  adopted  a method  of  allocating overhead  costs between
competitive and noncompetitive  services, concluding  that competitive  services
receive  no cross-subsidy  from noncompetitive  services. Appeals  of the Remand
Order were denied by the  Appellate Court on January 6,  1993 and denied by  the
Illinois Supreme Court on March 31, 1993.
 
    In April 1991, the Company began offering Optical Interconnection Service to
interconnect with alternative local transport carriers. The tariff enables other
certified  telecommunications carriers  to provide transport  to Company central
offices for purposes of reselling the Company's digital, nonswitched  intrastate
private line and special access service via DS1 and DS3 high capacity circuits.
 
    In  November 1991,  the ICC began  a reconnaissance management  audit of the
Company. The audit consisted of a broad-based review of the Company's management
and operations. The ICC Staff concluded  that, on an overall basis, the  Company
is  well-managed and  ranks above  average. Due to  the scope  and difficulty in
reviewing the  Company's affiliated  relationships, the  ICC ordered  a  focused
management  audit  of the  Company's affiliated  interest transactions.  A final
report on the focused audit  was issued in July  1993 that generally found  that
the  Company was a  relatively low cost  provider of telecommunications services
and that it obtained efficient services from its affiliates. For more discussion
on the reconnaissance management audit see page 14.
 
                                       4
<PAGE>
    On May 12, 1992, the Illinois General Assembly voted to revise the Universal
Telephone Service Protection Law of 1985. The new law enables the ICC to approve
alternative regulation  of  any  type,  subject to  explicit  policy  goals.  In
addition,  the  law  transfers  authority over  intraLATA  equal  access dialing
arrangements to  the  ICC. Telephone  companies  may transmit  electronic  news,
features  and advertising  only through  resale from  a separate  or independent
provider. In the realm of competitive  pricing, the law requires that  telephone
companies  providing  essential facilities  impute  the rate  charged  for those
facilities to themselves and that telephone companies are required to  apportion
overhead and embedded costs between competitive and noncompetitive services. The
new telecommunications law remains in effect until July 1, 1999.
 
    On  December 1, 1992,  the Company filed  an alternative regulation proposal
with the ICC. Under the proposal, rate of return (earnings) regulation would  be
replaced  with price regulation. Maximum rate levels for noncompetitive services
would  be  determined  by  a  formula  consisting  of  an  inflation  factor,  a
productivity offset and a service quality component. A final decision by the ICC
is expected during the second quarter of 1994.
 
    In December 1993, Ameritech proposed to the Department of Justice a trial of
its  Customers First Plan (see page 7) in Illinois to begin in the first quarter
of 1995. In  February 1994, Ameritech  filed tariffs with  the ICC that  propose
specific  rates and procedures  to open the local  network in Illinois. Approval
could take up to eleven months.
 
FCC REGULATORY JURISDICTION
 
    The  Company  is   also  subject   to  the  jurisdiction   of  the   FCC
with respect to intraLATA interstate, interstate access  services and other
matters.  The FCC  prescribes  for communications companies a  uniform system of
accounts, rules for  apportioning costs  between  regulated  and nonregulated
services,  depreciation  rates (for interstate services) and  the principles
and  standard procedures  ("separations procedures")  used  to separate
property costs,  revenues, expenses,  taxes and reserves between those
applicable to interstate services under the  jurisdiction of  the  FCC and
those applicable  to  services under  the jurisdiction  of respective state
regulatory authorities.
 
    For certain companies, including the Company, interstate services  regulated
by  the FCC  are covered  by a price  cap plan.  The plan  creates incentives to
improve productivity over benchmark levels  in order to retain higher  earnings.
Price  cap regulation sets maximum limits on  the prices that may be charged for
telecommunications services  but also  provides for  a sharing  of  productivity
gains. Earnings in excess of 12.25% will result in prospective reductions of the
price ceilings on interstate services.
 
    In  January 1994, the FCC began a scheduled fourth-year comprehensive review
of price cap regulation for local exchange companies.
 
ACCESS CHARGE ARRANGEMENTS
 
  INTERSTATE ACCESS CHARGES
 
    The Ameritech landline telephone companies  provide access services for  the
origination and termination of interstate telecommunications. The access charges
are of three types: common line, switched access and trunking.
 
    The  common line  portion of  interstate revenue  requirements are recovered
through monthly  subscriber line  charges  and per  minute carrier  common  line
charges.  The carrier  common line  rates include  recovery of  transitional and
long-term support payments  for distribution to  other local exchange  carriers.
Transitional  support payments were made over a four-year period ending on April
1, 1993. Long-term support payments will continue indefinitely.
 
    Effective  January  1,  1994,  rates  for  local  transport  services   were
restructured  and  a  new  "trunking"  service  category  was  created. Trunking
services consist of two types: those associated with the local transport element
of switched access and those  associated with special access. Trunking  services
associated  with switched  access handle the  transmission of  traffic between a
local exchange carrier's  serving wire  center and  a Company  end office  where
local switching occurs. Trunking services
 
                                       5
<PAGE>
associated  with special  access handle  the transmission  of telecommunications
services  between   any   two   customer-designated  premises   or   between   a
customer-designated  premise and a Company end office where multiplexing occurs.
High  volume  customers  generally  use  the  flat-rated  dedicated   facilities
associated   with  special  access,  while   usage  sensitive  rates  apply  for
lower-volume customers that utilize a common switching center.
 
    Local transport rate elements  for switched services  assess a flat  monthly
rate  and  a  mileage  sensitive  rate for  the  physical  facility  between the
customer's point  of termination  and  the end  office,  a usage  sensitive  and
mileage  sensitive  rate  assessed for  the  facilities between  the  end office
through the access tandem to the customer's serving wire center, and a minute of
use charge assessed to  all local transport. The  flat rate transport rates  and
structure  generally mirror  special access  rate elements.  Customers can order
direct transport  between the  serving wire  center and  the access  tandem  and
tandem switched transport between the access tandem and the end office.
 
    Special  access charges are monthly charges assessed to customers for access
to interstate  private line  service. Charges  are paid  for local  distribution
channels, interoffice mileage and optional features and functions.
 
  STATE ACCESS CHARGES
 
    Compensation  arrangements  required  in  connection  with  origination  and
termination of intrastate communications  by interexchange carriers are  subject
to  the jurisdiction of the ICC.  The Company currently provides access services
to interexchange carriers  which provide service  between MSAs within  Illinois,
pursuant to tariffs which generally parallel the terms, conditions and structure
of  the interstate access  tariffs. Similar tariff  provisions also cover access
service to  interexchange carriers  authorized  by the  ICC to  provide  service
within a MSA.
 
    Separate   arrangements   govern  compensation   between  the   Company  and
independent telephone companies for jointly provided communications within MSAs.
These arrangements are subject  to the jurisdiction of  the ICC and involve  the
payment  of traffic sensitive  access charges (at  parity with intrastate access
charges)  and  lease  payments  for   intraMSA  toll  traffic  originating   and
terminating  within each company's territory and  for facilities jointly used in
providing intraMSA toll service.
 
COMPETITION
 
    Regulatory, legislative and judicial  decisions and technological  advances,
as well as heightened customer interest in advanced telecommunications services,
have  expanded the types  of available communications  services and products and
the number of companies  offering such services.  Market convergence, already  a
reality, is expected to intensify.
 
    The  FCC has taken  a series of  steps that is expanding opportunities for
companies to compete  with local  exchange carriers in  providing services  that
fall  under the  FCC's jurisdiction.  In September  1992, the  FCC mandated that
local exchange carriers provide network access for special transmission paths to
competitive access providers, interexchange carriers and end users. In  February
1993,  Ameritech filed a tariff with the FCC, which was effective in May, making
possible this type of interconnection. In  August 1993, the FCC issued an  order
that  permits competitors to  interconnect to local  telephone company switches.
Under the  new rules,  certain  telephone companies  must allow  all  interested
parties  to terminate their switched access transmission facilities at telephone
company central offices, wire centers, tandem switches and certain remote nodes.
Ameritech filed a  tariff in  November 1993 to  effect that  change in  February
1994.
 
    Ameritech  is seeking opportunities to compete on an equal footing. Although
the Company is barred  from providing interLATA  and nationwide cable  services,
its  competitors are not. Cellular telephone and other wireless technologies are
poised  to  bypass  Ameritech's  local  access  network.  Cable  providers,  who
currently  serve  more  than eighty  percent  of American  homes,  could provide
telephone service and have expressed their desire to do so. Certain  competitive
access  providers  and  interexchange  carriers  have  demonstrated  interest in
providing local exchange service, with one company--MFS Communications  Company,
Inc.    having    already   filed    a   petition    with   the    ICC   seeking
 
                                       6
<PAGE>
authority to  provide  full  local  exchange service.  Ameritech's  plan  is  to
facilitate  competition in the local exchange business  at the same time that it
be permitted to compete in the total communications marketplace.
 
CUSTOMERS FIRST: AMERITECH'S ADVANCED UNIVERSAL ACCESS PLAN
 
    In 1993, Ameritech embarked on a long-range restructuring with the intent of
dramatically changing  the way  it  serves its  customers,  and in  the  process
altered  its corporate framework, expanding the nature and scope of its services
and supporting the  development of  a fully competitive  marketplace. In  March,
Ameritech  filed a plan with the FCC  to change the way local telecommunications
services are  provided and  regulated  and to  furnish  a policy  framework  for
advanced  universal access to modern telecommunications services-voice, data and
video information.
 
    Ameritech proposes to facilitate competition in the local exchange  business
by allowing other service providers to purchase components of its network and to
repackage  them with their own services for  resale, in exchange for the freedom
to compete in both its  existing and currently prohibited businesses.  Ameritech
has requested regulatory reforms to match the competitive environment as well as
support  of  its efforts  to remove  restraints, such  as the  interLATA service
restriction,  which   currently  restrict   its   participation  in   the   full
telecommunications marketplace. In addition, Ameritech asks for more flexibility
in pricing new and competitive services and replacement of caps on earnings with
price  regulation.  Under  the plan,  customers  would  be able  to  choose from
competitive providers for local  service as they now  can choose a provider  for
interexchange service.
 
    To  demonstrate conclusively the substantial  customer and economic benefits
of full competition, in  December 1993 Ameritech proposed  a trial of its  plan,
beginning  in  1995.  Ameritech  has petitioned  the  Department  of  Justice to
recommend Federal  District Court  approval  of a  waiver of  the  long-distance
restriction  of the  Consent Decree  so that  Ameritech can  offer interexchange
service. At the same time, Ameritech  would facilitate the development of  local
communications   markets  by  unbundling  the   local  network  and  integrating
competitors' switches. The trial would begin in Illinois in the first quarter of
1995 and would last indefinitely. Other states could be added over time. If  the
trial  is approved by the Department of Justice, the request must be acted on by
the Court which retains jurisdiction over administering the terms of the Consent
Decree. In February  1994, Ameritech  filed tariffs  with the  ICC that  propose
specific  rates and procedures  to open the local  network in Illinois. Approval
could take up to eleven months.
 
    Ameritech has  received broad  support  for the  plan from  Midwest  elected
officials,   national  and  Midwest  business  leaders,  and  education,  health
industry, economic  development and  consumer leaders.  The national  and  local
offices  of the Communications Workers of  America ("CWA") and the International
Brotherhood of Electrical Workers ("IBEW") also support the plan.
 
AMERITECH'S VIDEO NETWORK CONCEPT
 
    In January 1994, Ameritech filed plans  with the FCC to construct a  digital
video  network upgrade that could reach six  million customers by the end of the
decade. Ameritech  expects to  spend  $4.4 billion  to  upgrade its  network  to
provide  video services, part of a  total of approximately $29 billion Ameritech
estimates it will  spend on network  improvements over the  next fifteen  years.
Ameritech  is pursuing alliances and partnerships that will position it as a key
participant in the emerging  era of interactive  video experiences. Pending  FCC
approval  of  Ameritech's plan  and clearing  of  other regulatory  hurdles, the
construction of the first phase of the network could begin as soon as the fourth
quarter of 1994. The new network,  which will be separate from Ameritech's  core
local  communications  network, will  be expanded  to approximately  one million
additional Midwest customers in each of the next five years.
 
    Ameritech would  be only  one of  many  users of  the broadband  network.  A
multitude  of competing  video information  providers, businesses, institutions,
interexchange carriers and video  telephony customers will  also have access  to
the technology.
 
    With  the new  system, customers will  have access to  a virtually unlimited
variety of programming  sources. These  will include  basic broadcast  services,
similar to today's cable service, and advanced
 
                                       7
<PAGE>
interactive  services  such as  video  on demand,  home  healthcare, interactive
educational software, distance learning, interactive  games and shopping, and  a
variety  of other  entertainment and information  services that  can be accessed
from homes, offices, schools, hospitals, libraries and other public and  private
institutions.
 
CABLE/TELCO CROSS OWNERSHIP BAN
 
    In  August 1993,  Bell Atlantic  won the right  to enter  the video services
business in its own  service area. The  U.S. District Court  in the District  of
Columbia  that permitted entry to Bell Atlantic denied the requests of Ameritech
and the other RHCs.  In response, in November  1993, Ameritech filed motions  in
two  federal courts seeking freedom from the  ban on providing video services in
its own  service area.  Ameritech asked  U.S. District  Courts in  Illinois  and
Michigan  to declare  unconstitutional the provisions  of the Cable  Act of 1984
that bar the  RHCs from  providing cable  TV service  in areas  where they  hold
monopolies on local phone service.
 
    Legislation   has  been  introduced  in   Congress  that  would  repeal  the
cross ownership ban.
 
EMPLOYEE RELATIONS
 
    As of December 31, 1993, the  Company had 17,785 employees, a decrease  from
18,914  at December 31, 1992. During 1993, 1,226 employees left the payroll as a
result of voluntary and involuntary workforce reduction programs, which included
approximately 600 nonmanagement employees who  took advantage of a  Supplemental
Income  Protection  Program  ("SIPP")  established  under  labor  agreements  to
voluntarily exit the workforce. 

On March  25, 1994, Ameritech announced that  it will  reduce its 
nonmanagement workforce by 6,000  employees by the end of 1995,
including approximately 1,560 at the Company. Under terms of agreements  between
Ameritech, the CWA and the IBEW, Ameritech is implementing an enhancement to the
Ameritech pension plan by adding three years to the age and net credited service
of  eligible nonmanagement employees who leave  the business during a designated
period that ends in mid-1995. In addition, Ameritech's network business unit  is
offering  financial incentives under the terms of its current contracts with the
CWA and IBEW to selected nonmanagement  employees who leave the business  before
the end of 1995.
 
    The  reduction  of the  workforce  results from  technological improvements,
consolidations and  initiatives identified  by management  to balance  its  cost
structure with emerging competition.
 
    Approximately  84% of the Company's employees  are represented by unions. Of
those so represented, about  17% are represented  by the CWA  and about 83%  are
represented by the IBEW, both of which are affiliated with the AFL-CIO.
 
    In  July and August 1993, the Ameritech landline telephone companies and ASI
reached agreement  with  the two  unions  on  a workforce  transition  plan  for
assigning  union-represented employees to the  newly established business units.
The separate  agreements  with  the  CWA and  the  IBEW  extend  existing  union
contracts  with the landline telephone  companies and ASI to  the new units. The
pacts address  a  number of  force  assignment, employment  security  and  union
representation  issues. In  1995, when  union contracts  are due  to expire, the
parties will negotiate regional contracts.
 
ITEM 2. PROPERTIES.
 
    The properties  of the  Company do  not lend  themselves to  description  by
character  and location of principal units. At December 31, 1993, central office
equipment represented  38% of  the  Company's investment  in  telecommunications
plant  in service; land and buildings  (occupied principally by central offices)
represented  10%;  telecommunications   instruments  and   related  wiring   and
equipment, including private branch exchanges, substantially all of which are on
the premises of customers, represented 4%; and connecting lines which constitute
outside  plant, the majority of which are  on or under public roads, highways or
streets and the remainder of which are on or under private property, represented
41%.
 
    Substantially  all  of  installations   of  central  office  equipment   and
administrative offices are located in buildings owned by the Company situated on
land  which  it  owns in  fee.  Many garages,  administrative  offices, business
offices and  some  installations  of  central office  equipment  are  in  rented
quarters.
 
                                       8
<PAGE>
ITEM 3. LEGAL PROCEEDINGS.
 
PRE-DIVESTITURE CONTINGENT LIABILITIES AGREEMENT
 
    The  Plan provides for  the recognition and payment  of liabilities that are
attributable to pre-divestiture events (including transactions to implement  the
divestiture)  but  that do  not become  certain  until after  divestiture. These
contingent liabilities relate  principally to litigation  and other claims  with
respect  to the former  Bell System's rates,  taxes, contracts, equal employment
matters, environmental  matters and  torts (including  business torts,  such  as
alleged violations of the antitrust laws).
 
    With respect to such liabilities, AT&T and the Bell Companies, including the
Company,  will  share  the  costs  of any  judgment  or  other  determination of
liability entered by a  court or administrative agency,  the costs of  defending
the  claim (including attorneys' fees and court  costs) and the cost of interest
or penalties with respect to any  such judgment or determination. Except to  the
extent  that  affected parties  may otherwise  agree, the  general rule  is that
responsibility for such contingent  liabilities will be  divided among AT&T  and
the  Bell Companies on  the basis of  their relative net  investment (defined as
total assets  less  reserves for  depreciation)  as  of the  effective  date  of
divestiture.  Different  allocation  rules  apply  to  liabilities  which relate
exclusively to pre-divestiture interstate or intrastate operations.
 
    Although complete  assurance  cannot be  given  as  to the  outcome  of  any
litigation, in the opinion of the Company's management any monetary liability or
financial  impact to which the Company would be subject after final adjudication
or settlement of all  such liabilities would  not be material  in amount to  the
financial position of the Company.
 
                                       9
<PAGE>
                                    PART II
 
ITEM 6. SELECTED FINANCIAL AND OPERATING DATA.
 
                        ILLINOIS BELL TELEPHONE COMPANY
                     SELECTED FINANCIAL AND OPERATING DATA
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                             1993        1992        1991        1990        1989
                                          ----------  ----------  ----------  ----------  ----------
<S>                                       <C>         <C>         <C>         <C>         <C>
Revenues
  Local service.........................  $  1,834.2  $  1,768.4  $  1,737.5  $  1,672.4  $  1,657.8
  Interstate network access.............       701.5       688.0       661.7       667.1       642.2
  Intrastate network access.............        80.4        79.2        68.8        64.2        64.4
  Long distance.........................       162.3       162.8       173.2       192.4       206.7
  Other.................................       262.6       248.0       244.7       251.0       256.6
                                          ----------  ----------  ----------  ----------  ----------
                                             3,041.0     2,946.4     2,885.9     2,847.1     2,827.7
Operating expenses......................     2,273.1     2,212.6     2,254.9     2,187.2     2,182.7
                                          ----------  ----------  ----------  ----------  ----------
Operating income........................       767.9       733.8       631.0       659.9       645.0
Interest expense........................       119.9       114.2       131.5       116.2       118.9
Other expense (income)-net..............         9.9         4.8       (19.4)       (2.8)       (2.1)
Income taxes............................       220.9       201.4       166.7       187.8       184.1
                                          ----------  ----------  ----------  ----------  ----------
Income before cumulative effect of
 change in accounting principles........       417.2       413.4       352.2       358.7       344.1
Cumulative effect of change in
 accounting principles..................      --          (588.6)     --          --          --
                                          ----------  ----------  ----------  ----------  ----------
Net income (loss).......................  $    417.2  $   (175.2) $    352.2  $    358.7  $    344.1
                                          ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------
Total assets............................  $  6,176.2  $  6,095.2  $  6,008.4  $  5,866.3  $  5,507.9
                                          ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------
Telecommunications plant--net...........  $  5,038.5  $  4,995.7  $  4,911.6  $  4,834.8  $  4,731.1
Capital expenditures--net...............  $    534.4  $    577.0  $    558.5  $    545.4  $    583.3
Long-term debt..........................  $  1,077.0  $  1,330.1  $  1,379.8  $  1,378.7  $  1,379.6
                                          ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------
Debt ratio..............................        47.6%       46.9%       41.5%       40.4%       39.7%
                                          ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------
Return to average equity................        22.3%       (9.7)%       15.2%       15.8%       15.9%
                                          ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------
Return on average total capital.........        14.7%       (1.8)%       11.6%       12.1%       11.9%
                                          ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------
Pretax interest coverage................         6.4         6.4         5.3         5.9         5.6
                                          ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------
Customer lines-at end of year (000's)...       5,763       5,586       5,460       5,360       5,232
Customer lines served by--
  Digital electronic offices............        64.6%       50.8%       43.9%       39.5%       36.5%
  Analog electronic offices.............        35.4%       49.2%       56.1%       60.5%       63.0%
  Electromechanical offices.............      --    %     --    %     --    %     --    %        0.5%
Customer lines per employee.............         324         295         267         251         233
Local calls per year (000,000's)........      19,207      18,414      17,797      16,855      16,316
Calls per customer line.................       3,333       3,296       3,259       3,145       3,118
Employees--at end of year...............      17,785      18,914      20,470      21,386      22,495
</TABLE>
 
                                       10
<PAGE>
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF RESULTS OF OPERATIONS.
(DOLLARS IN MILLIONS)
 
    Following  is a discussion and analysis of  the results of operations of the
Company for the year ended December 31, 1993 and for the year ended December 31,
1992, which is  based on the  Consolidated Statements of  Income and  Reinvested
Earnings.  Other pertinent  data are  also given  in the  Selected Financial and
Operating Data.
 
RESULTS OF OPERATIONS
 
  REVENUES
 
<TABLE>
<CAPTION>
                                                                            INCREASE
                                                     1993        1992      (DECREASE)      % CHANGE
                                                  ----------  ----------  -------------  -------------
<S>                                               <C>         <C>         <C>            <C>
Local service...................................  $  1,834.2  $  1,768.4    $    65.8           3.7%
</TABLE>
 
    Higher calling  volumes  increased  local service  revenues  by  $67.2.  The
    increased  calling  volumes were  primarily attributed  to higher  usage and
    growth in the number  of customer lines, which  increased 3.2% to  5,763,394
    from 5,586,023.
 
<TABLE>
<CAPTION>
                                                                            INCREASE
                                                     1993        1992      (DECREASE)      % CHANGE
                                                  ----------  ----------  -------------  -------------
<S>                                               <C>         <C>         <C>            <C>
Network access
  Interstate....................................  $    701.5  $    688.0    $    13.5           2.0%
  Intrastate....................................  $     80.4  $     79.2    $     1.2           1.5%
</TABLE>
 
    Interstate  access revenues  increased by  $24.7 due  to growth  of customer
    lines and switched access minutes of use and by $20.8 due to a reduction  in
    National Exchange Carrier Association support payments. These increases were
    offset by lower revenues of $22.7 due to rate reductions for common carrier,
    switched  and special access services and $10.5  due to a decline in special
    access service volumes. The increase in intrastate revenues is primarily due
    to growth of switched access minutes of use.
 
<TABLE>
<CAPTION>
                                                                            INCREASE
                                                     1993        1992      (DECREASE)      % CHANGE
                                                  ----------  ----------  -------------  -------------
<S>                                               <C>         <C>         <C>            <C>
Long distance...................................  $    162.3  $    162.8    $    (0.5)         (0.3)%
</TABLE>
 
    Long distance revenues decreased by  $1.6 due to lower interstate  intraLATA
    toll  rates, offset by a  $1.0 increase in revenues  due to volume growth of
    interstate intraLATA and private line usage.
 
<TABLE>
<CAPTION>
                                                                            INCREASE
                                                     1993        1992      (DECREASE)      % CHANGE
                                                  ----------  ----------  -------------  -------------
<S>                                               <C>         <C>         <C>            <C>
Other...........................................  $    262.6  $    248.0    $    14.6           5.9%
</TABLE>
 
    Other revenues include revenues derived from directory advertising,  billing
    and  collection services, inside wire  installation and maintenance services
    and other miscellaneous services.  These revenues are  net of the  Company's
    provision  for uncollectibles. The increase  in other revenues was primarily
    due to growth of inside wire, directory and billing and collection  services
    of  $9.4. Also contributing  to the higher  revenues was a  $3.3 increase in
    rent revenues  due  to  office  space  and  computer  rentals  to  Ameritech
    Services,  Inc.  (ASI),  an  affiliate,  and  a  $1.1  lower  uncollectibles
    provision, resulting from an overall improvement in collection efforts.
 
  OPERATING EXPENSES
 
    The Company has changed  the presentation of its  operating expenses in  the
Consolidated Statements of Income and Reinvested Earnings to facilitate a better
understanding   of  its  operating   results.  Prior  year   amounts  have  been
reclassified to conform with this presentation.
 
<TABLE>
<CAPTION>
                                                                            INCREASE
                                                     1993        1992      (DECREASE)      % CHANGE
                                                  ----------  ----------  -------------  -------------
<S>                                               <C>         <C>         <C>            <C>
Employee-related expenses.......................  $    882.8  $    869.0    $    13.8             1.6%
</TABLE>
 
    Employee-related expenses  include  employee salaries,  benefits  and  other
    employee-related  expenses.  Wage  rate increases  and  higher nonmanagement
    employee bonuses were offset by salary  savings created from a reduced  work
    force as a result of early retirement programs, involuntary terminations and
    the  transfer of employees to ASI. As  a result of involuntary and voluntary
 
                                       11
<PAGE>
    termination programs, 1,226 and 676 employees  left the Company in 1993  and
    1992, respectively. In addition, during 1992, 862 employees were transferred
    to  ASI. The Company's work  force decreased to 17,785  at December 31, 1993
    from 18,914 at December 31, 1992. Other employee benefits were higher due to
    lower pension  credits  and an  increase  in the  costs  for  postretirement
    benefits and other employee benefits.
 
<TABLE>
<CAPTION>
                                                                          INCREASE
                                                    1993       1992      (DECREASE)      % CHANGE
                                                  ---------  ---------  -------------  -------------
<S>                                               <C>        <C>        <C>            <C>
Depreciation and amortization...................  $   506.9  $   509.6    $    (2.7)          (0.5)%
</TABLE>
 
    Depreciation and amortization expense decreased by $8.5 primarily due to the
    completion of Illinois Commerce Commission authorized amortization of public
    telephone  embedded  labor and  depreciation  reductions resulting  from the
    retirement of internal data and communications equipment. Lower  investments
    in capital leases resulted in an additional decrease of $1.0 in amortization
    expense.  These declines were offset by  a $6.8 increase in depreciation due
    to overall higher plant investment.
 
<TABLE>
<CAPTION>
                                                                          INCREASE
                                                    1993       1992      (DECREASE)       % CHANGE
                                                  ---------  ---------  -------------  ---------------
<S>                                               <C>        <C>        <C>            <C>
Other operating expenses........................  $   796.2  $   742.8    $    53.4            7.2%
</TABLE>
 
    The increase  in other  operating  expenses was  primarily  due to  a  $33.1
    increase  in affiliated services, primarily  related to charges for services
    previously performed  internally by  work groups  transferred to  ASI.  Also
    contributing  to  the  increase  were  higher  contract  services  of $15.4,
    primarily for  right-to-use  fees  for  the  license  of  telecommunications
    software.  Advertising  expenses increased  by  $13.7 primarily  due  to the
    marketing of the Company's products and services under the single brand name
    "Ameritech." These increases  were offset  slightly by an  $8.8 decrease  in
    other   miscellaneous  expenses  associated   with  market  realignment  and
    workforce resizing.
 
<TABLE>
<CAPTION>
                                                                          INCREASE
                                                    1993       1992      (DECREASE)      % CHANGE
                                                  ---------  ---------  -------------  -------------
<S>                                               <C>        <C>        <C>            <C>
Taxes other than income taxes...................  $    87.2  $    91.2    $    (4.0)         (4.4)%
</TABLE>
 
    Taxes other than  income taxes  decreased $5.7  due to  lower capital  stock
    taxes,  resulting from lower average  reinvested earnings. Also contributing
    to the lower expense was a $2.5 decline in gross receipts taxes,  reflecting
    the   impact  of  the  adoption  of   a  municipal  excise  tax  by  certain
    municipalities, which  replaced  previously enacted  gross  receipts  taxes.
    These decreases were offset by a $4.9 increase in property taxes.
 
  OTHER INCOME AND EXPENSES
 
<TABLE>
<CAPTION>
                                                                          INCREASE
                                                    1993       1992      (DECREASE)       % CHANGE
                                                  ---------  ---------  -------------  ---------------
<S>                                               <C>        <C>        <C>            <C>
Interest expense................................  $   119.9  $   114.2    $     5.7            5.0%
</TABLE>
 
    Interest  expense  increased  by $1.4  due  to higher  interest  incurred on
    long-term debt and by $1.5 due to interest incurred on short-term debt as  a
    result  of higher average notes payable.  In addition, 1992 interest expense
    reflects $2.2 of interest credits related to prior year tax filings.
 
<TABLE>
<CAPTION>
                                                                          INCREASE
                                                    1993       1992      (DECREASE)      % CHANGE
                                                  ---------  ---------  -------------  ------------
<S>                                               <C>        <C>        <C>            <C>
Other expense (income)--net.....................  $     9.9  $     4.8    $     5.1         106.3%
</TABLE>
 
    Other expense (income)-net increased  by $17.4 due to  costs related to  the
    early  extinguishment of $750.0 of the  Company's long-term debt and by $7.0
    due to interest income received in 1992 related to Internal Revenue  Service
    settlements  of federal income  taxes. These increases  were offset by $18.2
    primarily due  to higher  equity earnings  for ASI  and lower  miscellaneous
    expenses.
 
<TABLE>
<CAPTION>
                                                                          INCREASE
                                                    1993       1992      (DECREASE)       % CHANGE
                                                  ---------  ---------  -------------  ---------------
<S>                                               <C>        <C>        <C>            <C>
Income taxes....................................  $   220.9  $   201.4    $    19.5            9.7%
</TABLE>
 
    Income taxes increased primarily as a result of higher pre-tax income and an
    increase in the federal statutory income tax rate.
 
                                       12
<PAGE>
OTHER MATTERS
 
  CHANGES IN ACCOUNTING PRINCIPLES
 
    Effective  January  1,  1993,  the Company  adopted  Statement  of Financial
Accounting Standards ("SFAS") No.  109, "Accounting for  Income Taxes." The  new
accounting method is essentially a refinement of the method the Company had been
following  and, accordingly,  did not  have a  material impact  on the Company's
financial statements upon adoption.
 
    As more fully discussed in Note C to the Consolidated Financial  Statements,
effective  January  1,  1992,  the Company  adopted  SFAS  No.  106, "Employers'
Accounting for Postretirement Benefits Other  than Pensions," and SFAS No.  112,
"Employers'  Accounting for  Postemployment Benefits." The  cumulative effect of
these accounting changes was recognized in the first quarter of 1992 as a change
in accounting principles  of $588.6,  net of a  deferred income  tax benefit  of
$360.2.
 
  REGULATORY ENVIRONMENT
 
    Customer  demand, technology  and the preferences  of policy  makers are all
converging to increase competition in  the local exchange business. The  effects
of  increasing competition are  apparent in the  marketplace the Company serves.
For  example,  one  competitive  access  provider--MFS  Communications  Company,
Inc.--has  requested regulatory authority to provide full local exchange service
in  Illinois.  Additionally,  increasing  volumes  of  intraLATA  long  distance
services  purchased by  large and  medium sized  business customers  are sold by
carriers other than the Company.
 
    Recognizing the trend, the Company's regulatory/public policy activities are
focused on achieving  a framework  that allows for  expanding competition  while
providing  a  fair  opportunity  for all  carriers,  including  the  Company, to
succeed. The cornerstone of  this effort is  Ameritech's "Customers First  Plan"
that  was filed with  the Federal Communications Commission  ("FCC") on March 1,
1993. In a  subsequent filing  with the  U.S. Department  of Justice,  Ameritech
proposed that the Customers First Plan be implemented on a trial basis beginning
in  January 1995 in Illinois. In February 1994, Ameritech filed tariffs with the
Illinois Commerce Commission ("ICC") that propose specific rates and  procedures
to open the local network in Illinois. Approval could take up to eleven months.
 
    The  Customers  First  Plan proposes  to  open  all of  the  local telephone
business in the Company's  service area to  competition. In exchange,  Ameritech
has  requested three regulatory  changes. First, Ameritech  has requested relief
from the Modified Final Judgment ("MFJ")  interLATA ban. Such relief would  mean
that  the Company would be allowed to  offer all long distance services. Second,
Ameritech has requested a number of modifications in the FCC's price cap  rules.
These  modifications would apply  only to Ameritech,  including the Company, and
would eliminate any obligation  to refund, in  the form of  its share of  future
rate  reductions,  its share  of interstate  earnings in  excess of  12.25%. The
modifications would  also provide  the Company  increased ability  to price  its
interstate  access services in  a manner appropriate  to competitive conditions.
Third, Ameritech  has requested  FCC  authority to  collect in  a  competitively
neutral  manner, the social  subsidies currently embedded in  the rates that the
Company charges long distance carriers for access to the local network.
 
  REGULATORY PROCEEDINGS
 
    On December  1,  1992,  the  Company  submitted  an  alternative  regulation
proposal  to the  ICC. Under  the proposal, rate  of return  regulation would be
eliminated and replaced by a price regulation mechanism, under which future rate
changes for noncompetitive services would be subject to a predetermined  formula
reflecting  changes in inflation, the Company's historic productivity and actual
service quality performance. The proposal would not affect the Company's ability
to set prices for services which  are classified as competitive services by  the
ICC, and the Company would also be able to determine its own depreciation rates.
If  the proposal is adopted by the  ICC, the Illinois Public Utilities Act would
require that  basic  residential  rates  cannot be  increased  for  three  years
following the proposal's effective date.
 
    In  July 1993, the  ICC Staff and  The Citizens Utility  Board ("CUB") filed
testimony in the proceeding recommending rate reductions in the range of  $100.0
to  $200.0. The Company disagrees with the Staff's and CUB's recommendations and
filed its response in September 1993. Additional
 
                                       13
<PAGE>
rebuttal testimony was filed in October 1993.  The record was closed at the  end
of November 1993, and a final decision by the ICC is not expected before the end
of  the second quarter 1994. At this time, the Company cannot predict if the ICC
will approve  the alternative  regulation proposal  or order  any reductions  in
rates.
 
    In  November 1991,  the ICC began  a reconnaissance management  audit of the
Company. The audit consisted of a broad-based review of the Company's management
and operations. The ICC Staff concluded  that, on an overall basis, the  Company
is  well-managed and  ranked above  average. Due to  the scope  of reviewing the
Company's affiliated relationships, the ICC  ordered a focused management  audit
of  the  Company's affiliated  interest transactions.  In  July 1993,  the ICC's
auditors issued  a report  recommending the  imputation of  $51.0 in  additional
Yellow Pages revenues to the Company's regulated operations and proposed expense
disallowances   of   approximately   $28.0.  The   ICC   Staff   utilized  these
recommendations as part of the  basis for proposing prospective rate  reductions
in  the Company's pending  alternative regulation filing.  The Company disagrees
with the  ICC  Staff's  recommendations  and  discussed  this  in  its  rebuttal
testimony in September and October 1993.
 
  REGULATORY ACCOUNTING
 
    The  Company  presently  gives  accounting  recognition  to  the  actions of
regulators where appropriate, as prescribed by SFAS No. 71, "Accounting for  the
Effects  of Certain Types of Regulation". Under SFAS No. 71, the Company records
certain assets  and  liabilities  because of  actions  of  regulators.  Further,
amounts  charged to operations for depreciation expense reflect estimated useful
lives and  methods  prescribed  by  regulators  rather  than  those  that  might
otherwise  apply to unregulated enterprises. In the event the Company determines
that it no longer meets the criteria  for following SFAS No. 71, the  accounting
impact  to the Company would be an extraordinary noncash charge to operations of
an amount which could be material. Criteria that give rise to the discontinuance
of SFAS No. 71 include (1) increasing competition which restricts the  Company's
ability  to establish  prices to recover  specific costs, and  (2) a significant
change in  the manner  in which  rates  are set  by regulators  from  cost-based
regulation to another form of regulation. The Company periodically reviews these
criteria to ensure that continuing application of SFAS No. 71 is appropriate.
 
  BUSINESS UNITS
 
    In  February 1993, following a year-long  examination of its business called
"Breakthrough Leadership," Ameritech announced it would restructure its business
into separate  units  organized  around  specific  customer  groups  -  such  as
residential  customers,  small  businesses,  interexchange  companies  and large
corporations - and a single unit that will run Ameritech's network in  Illinois,
Indiana,  Michigan,  Ohio  and  Wisconsin.  The  Ameritech  Bell  Companies will
continue to function  as legal entities  owning current Bell  Company assets  in
each  state. The  network unit will  provide network  and information technology
resources in response to  the needs of  the other 11  business units. This  unit
will  be the source of network capabilities for products and services offered by
the other  business  units and  will  be  responsible for  the  development  and
day-to-day operation of an advanced information infrastructure.
 
    All  of the business  units and the network  unit are currently operational.
Ameritech has developed  a new logo  and is  marketing all of  its products  and
services under the single brand name "Ameritech."
 
  DIGITAL VIDEO NETWORK
 
    In  January 1994, Ameritech, the parent  of the Company, announced a program
to launch a digital video  network upgrade that is expected,  by the end of  the
decade, to make available interactive information and entertainment services, as
well  as traditional cable  TV services, to  approximately six million Ameritech
customers. The Company has filed an application with the FCC seeking approval of
the program.  The application  reflects  capital expenditures  of  approximately
$160.0  over the  next three  years. The Company  may also,  depending on market
demand, make additional  capital expenditures  under this  program. The  Company
anticipates that its capital expenditures for the program will be funded without
an increase to its recent historical level of capital expenditures.
 
                                       14
<PAGE>
  WORKFORCE RESIZING
 
    On March 25, 1994, Ameritech announced that it will reduce its nonmanagement
workforce  by 6,000 employees by the  end of 1995, including approximately 1,560
at the Company. Under terms of agreements between Ameritech, the  Communications
Workers  of  America ("CWA")  and  the International  Brotherhood  of Electrical
Workers ("IBEW"),  Ameritech is  implementing an  enhancement to  the  Ameritech
pension  plan  by adding  three years  to the  age and  net credited  service of
eligible nonmanagement  employees who  leave the  business during  a  designated
period  that ends in mid-1995. In addition, Ameritech's network business unit is
offering financial incentives under the terms of its current contracts with  the
CWA  and IBEW, to selected nonmanagement employees who leave the business before
the end of 1995.
 
    The above actions will result in a charge to first quarter 1994 earnings  of
approximately  $137.8 or $83.0  after-tax. A significant  portion of the program
cost will be funded by Ameritech's pension plan, whereas financial incentives to
be paid from company funds are  estimated to be approximately $36.9.  Settlement
gains,  which result from terminated  employees accepting lump-sum payments from
the pension plan, will  be reflected in income  as employees leave the  payroll.
The  Company believes  this program  will reduce  its employee-related  costs by
approximately $78.0 on an annual basis upon completion of this program.
 
    The reduction  of the  workforce  results from  technological  improvements,
consolidations  and  initiatives identified  by management  to balance  its cost
structure with emerging competition.
 
                                       15
<PAGE>
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Shareholder of Illinois Bell
  Telephone Company:
 
    We  have audited  the accompanying  consolidated balance  sheets of Illinois
Bell Telephone  Company  (an Illinois  corporation)  and its  subsidiary  as  of
December  31, 1993 and  1992, and the related  consolidated statements of income
and reinvested earnings and cash flows for each of the three years in the period
ended December  31,  1993.  These  consolidated  financial  statements  and  the
schedules  referred to below are the responsibility of the Company's management.
Our responsibility  is to  express an  opinion on  these consolidated  financial
statements and schedules based on our audits.
 
    We  conducted  our audits  in  accordance with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In  our  opinion, the  consolidated financial  statements referred  to above
present fairly, in  all material  respects, the financial  position of  Illinois
Bell  Telephone Company and subsidiary as of December 31, 1993 and 1992, and the
results of their operations and their cash flows for each of the three years  in
the  period  ended  December 31,  1993,  in conformity  with  generally accepted
accounting principles.
 
    As discussed in Note C to the consolidated financial statements, the Company
changed its method of accounting  for certain postretirement and  postemployment
benefits in 1992.
 
    Our  audits were  made for the  purpose of  forming an opinion  on the basic
consolidated financial  statements taken  as a  whole. The  financial  statement
schedules  listed in Item 14(a)(2) are  presented for purposes of complying with
the Securities and Exchange  Commission's rules and are  not a required part  of
the basic consolidated financial statements. These schedules have been subjected
to  the  auditing procedures  applied in  our audits  of the  basic consolidated
financial statements and, in our opinion, fairly state in all material  respects
the  financial data required  to be set  forth therein in  relation to the basic
consolidated financial statements taken as a whole.
 
                                          ARTHUR ANDERSEN & CO.
 
Chicago, Illinois
January 28, 1994
 
                                       16
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
           CONSOLIDATED STATEMENTS OF INCOME AND REINVESTED EARNINGS
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                   YEAR ENDED DECEMBER 31,
                                                                                -----------------------------
                                                                                 1993       1992       1991
                                                                                -------    -------    -------
<S>                                                                             <C>        <C>        <C>
REVENUES.....................................................................   $3,041.0   $2,946.4   $2,885.9
                                                                                -------    -------    -------
OPERATING EXPENSES
  Employee-related expenses..................................................     882.8      869.0      919.4
  Depreciation and amortization..............................................     506.9      509.6      497.4
  Other operating expenses...................................................     796.2      742.8      719.7
  Taxes other than income taxes..............................................      87.2       91.2      118.4
                                                                                -------    -------    -------
                                                                                2,273.1    2,212.6    2,254.9
                                                                                -------    -------    -------
OPERATING INCOME.............................................................     767.9      733.8      631.0
Interest expense.............................................................     119.9      114.2      131.5
Other expense (income) -- net................................................       9.9        4.8      (19.4)
                                                                                -------    -------    -------
INCOME BEFORE INCOME TAXES AND CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING
  PRINCIPLES.................................................................     638.1      614.8      518.9
Income taxes.................................................................     220.9      201.4      166.7
                                                                                -------    -------    -------
INCOME BEFORE CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING PRINCIPLES...........     417.2      413.4      352.2
Cumulative effect of change in accounting principles.........................     --        (588.6)     --
                                                                                -------    -------    -------
NET INCOME (LOSS)............................................................     417.2     (175.2)     352.2
REINVESTED EARNINGS, BEGINNING OF YEAR.......................................     114.5      584.7      560.7
DIVIDENDS....................................................................     398.5      295.0      328.2
                                                                                -------    -------    -------
REINVESTED EARNINGS, END OF YEAR.............................................   $ 133.2    $ 114.5    $ 584.7
                                                                                -------    -------    -------
                                                                                -------    -------    -------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                       17
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
                          CONSOLIDATED BALANCE SHEETS
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                     DECEMBER 31,    DECEMBER 31,
                                                                                         1993            1992
                                                                                    --------------  --------------
<S>                                                                                 <C>             <C>
ASSETS
CURRENT ASSETS
  Cash and temporary cash investments.............................................   $       14.7    $       17.6
  Receivables
    Customers and agents (less allowance for uncollectibles of $36.7 and $35.2,
     respectively)................................................................          591.6           561.7
    Ameritech and affiliates......................................................           40.9            10.4
    Other.........................................................................           30.8            54.5
  Material and supplies...........................................................           15.6            25.1
  Prepaid and other...............................................................           12.1            23.6
                                                                                    --------------  --------------
                                                                                            705.7           692.9
TELECOMMUNICATIONS PLANT
  In service......................................................................        8,115.1         8,021.5
  Under construction..............................................................          108.6           116.5
                                                                                    --------------  --------------
                                                                                          8,223.7         8,138.0
  Less, accumulated depreciation..................................................        3,185.2         3,142.3
                                                                                    --------------  --------------
                                                                                          5,038.5         4,995.7
                                                                                    --------------  --------------
INVESTMENTS, principally in affiliates............................................           86.8            71.4
OTHER ASSETS AND DEFERRED CHARGES.................................................          345.2           335.2
                                                                                    --------------  --------------
TOTAL ASSETS......................................................................   $    6,176.2    $    6,095.2
                                                                                    --------------  --------------
                                                                                    --------------  --------------
LIABILITIES AND SHAREHOLDER'S EQUITY
CURRENT LIABILITIES
  Debt maturing within one year
    Ameritech.....................................................................   $      494.2    $      275.7
    Other.........................................................................          100.3             1.5
  Accounts payable
    Ameritech and affiliates......................................................           79.3            79.9
    Other.........................................................................          321.5           297.8
  Other current liabilities.......................................................          404.6           394.2
                                                                                    --------------  --------------
                                                                                          1,399.9         1,049.1
                                                                                    --------------  --------------
LONG-TERM DEBT....................................................................        1,077.0         1,330.1
                                                                                    --------------  --------------
DEFERRED CREDITS
  Accumulated deferred income taxes...............................................          587.1           532.6
  Unamortized investment tax credits..............................................          109.9           128.1
  Postretirement benefits other than pensions.....................................          815.7           854.3
  Long-term payable to Ameritech Services, Inc....................................           30.9            32.7
  Other...........................................................................          317.7           349.0
                                                                                    --------------  --------------
                                                                                          1,861.3         1,896.7
                                                                                    --------------  --------------
SHAREHOLDER'S EQUITY
  Common stock ($20 par value; 100,000,000 shares authorized; 81,938,121 issued
   and outstanding)...............................................................        1,638.8         1,638.8
  Proceeds in excess of par value.................................................           66.0            66.0
  Reinvested earnings.............................................................          133.2           114.5
                                                                                    --------------  --------------
                                                                                          1,838.0         1,819.3
                                                                                    --------------  --------------
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY........................................   $    6,176.2    $    6,095.2
                                                                                    --------------  --------------
                                                                                    --------------  --------------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                       18
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                      YEAR ENDED DECEMBER 31,
                                                                                   -----------------------------
                                                                                    1993       1992       1991
                                                                                   -------    -------    -------
<S>                                                                                <C>        <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)...............................................................   $ 417.2    $(175.2)   $ 352.2
Adjustments to net income (loss):
  Cumulative effect of change in accounting principles..........................     --         588.6      --
  Depreciation and amortization.................................................     506.9      509.6      497.4
  Deferred income taxes--net....................................................      27.3       23.7       (9.2)
  Investment tax credits--net...................................................     (18.2)     (18.5)     (24.2)
  Interest during construction..................................................      (2.4)      (1.2)      (4.5)
  Provision for uncollectibles..................................................      34.4       35.5       38.9
Change in accounts receivable--net..............................................     (71.1)      (7.4)     (70.2)
Change in material and supplies.................................................       9.4       (3.0)       0.5
Change in prepaid expenses and certain other current assets.....................     (14.2)      (4.6)     (17.8)
Change in accounts payable......................................................      23.4       67.5       46.6
Change in accrued taxes.........................................................     (21.2)      40.1      (39.2)
Change in certain other current liabilities.....................................      16.6     (104.0)       4.1
Net change in certain noncurrent assets and liabilities.........................     (43.3)     (18.7)      10.8
Other...........................................................................      13.5       (5.3)      (2.8)
                                                                                   -------    -------    -------
Net cash from operating activities..............................................     878.3      927.1      782.6
                                                                                   -------    -------    -------
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures--net.......................................................    (534.4)    (577.0)    (558.5)
(Cost of) proceeds from disposals of telecommunications plant...................      (5.0)      (7.9)      11.8
Additional investments in affiliates (principally equity).......................      (9.9)     (14.4)      (4.9)
                                                                                   -------    -------    -------
Net cash from investing activities..............................................    (549.3)    (599.3)    (551.6)
                                                                                   -------    -------    -------
CASH FLOWS FROM FINANCING ACTIVITIES:
Net change in short-term debt...................................................     --         --        (157.8)
Intercompany financing--net.....................................................     218.5       30.7      245.0
Issuances of long-term debt.....................................................     295.9      --         --
Retirements of long-term debt...................................................    (451.5)     (58.8)      (8.2)
Costs of refinancing long-term debt.............................................     (10.0)     --         --
Dividend payments...............................................................    (384.8)    (293.2)    (324.5)
                                                                                   -------    -------    -------
Net cash from financing activities..............................................    (331.9)    (321.3)    (245.5)
                                                                                   -------    -------    -------
Net (decrease) increase in cash and temporary cash investments..................      (2.9)       6.5      (14.5)
Cash and temporary cash investments, beginning of year..........................      17.6       11.1       25.6
                                                                                   -------    -------    ------- 
Cash and temporary cash investments, end of year................................   $  14.7    $  17.6    $  11.1
                                                                                   -------    -------    -------
                                                                                   -------    -------    -------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                       19
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                             (DOLLARS IN MILLIONS)
 
    Illinois Bell Telephone Company ("the Company") is a wholly owned subsidiary
of Ameritech Corporation ("Ameritech").
 
    A. SIGNIFICANT ACCOUNTING POLICIES
 
    CONSOLIDATION--The consolidated financial statements include the accounts of
the Company  and  its  wholly owned  subsidiary,  Illinois  Bell  Administration
Center,  Inc. ("IBAC"), formed in 1988 to hold a limited partnership interest in
a real  estate  venture. All  significant  intercompany transactions  have  been
eliminated.
 
    BASIS   OF  ACCOUNTING--The  consolidated  financial  statements  have  been
prepared  in  accordance  with  generally  accepted  accounting  principles.  In
compliance  with SFAS No.  71, "Accounting for  the Effects of  Certain Types of
Regulation,"  the  Company  gives  accounting  recognition  to  the  actions  of
regulators  where appropriate. Such actions  can provide reasonable assurance of
the existence of an asset, reduce or eliminate the value of an asset or impose a
liability. Actions  of a  regulator can  also eliminate  a liability  previously
imposed by the regulator.
 
    TRANSACTIONS  WITH  AFFILIATES--The  Company  has  various  agreements  with
affiliated companies. Below  is a  description of  the significant  arrangements
followed by a table of the amounts involved.
 
1.   Ameritech Services, Inc. ("ASI")--ASI,  an Ameritech controlled affiliate
    in which  the Company  has 33%  ownership, provides  consolidated  planning,
    development,  management,  procurement and  support services  to all  of the
    Ameritech Bell companies.  The Company  also provides  certain services  and
    facilities to ASI.
 
<TABLE>
<CAPTION>
                                                                     1993       1992       1991
                                                                   ---------  ---------  ---------
<S>                                                                <C>        <C>        <C>
Purchases of materials and charges for services from ASI.........  $   537.0  $   503.6  $   430.4
Recovery of costs for services provided to ASI...................       34.9       24.7       26.8
</TABLE>
 
2.  Ameritech (the Company's parent)--Ameritech provides various administrative,
    planning,  financial and other  services to the  Company. These services are
    billed to the Company at cost.
 
<TABLE>
<CAPTION>
                                                                     1993       1992       1991
                                                                   ---------  ---------  ---------
<S>                                                                <C>        <C>        <C>
Charges incurred.................................................  $    32.5  $    33.1  $    33.4
</TABLE>
 
3.  Ameritech Publishing, Inc. ("API")--The Company has a contract with DonTech,
    a partnership between  API and  the Reuben H.  Donnelley Corporation,  under
    which  payments are  made to  the Company  by DonTech  for license  fees and
    billing and collection services.
 
<TABLE>
<CAPTION>
                                                                     1993       1992       1991
                                                                   ---------  ---------  ---------
<S>                                                                <C>        <C>        <C>
Fees paid to the Company by DonTech..............................  $    75.0  $    75.0  $    75.5
</TABLE>
 
4.  Ameritech Information Systems, Inc. ("AIS")--The Company reimburses AIS  for
    costs incurred by AIS in connection with the sale of network services by AIS
    employees.
 
<TABLE>
<CAPTION>
                                                                     1993       1992       1991
                                                                   ---------  ---------  ---------
<S>                                                                <C>        <C>        <C>
Charges incurred.................................................  $    11.4  $    13.2  $    14.3
</TABLE>
 
5.   Bell Communications Research, Inc. ("Bellcore")--Bellcore provides research
    and technical  support  to the  Company.  ASI has  a  one-seventh  ownership
    interest in Bellcore and bills the Company for the costs.
 
<TABLE>
<CAPTION>
                                                                     1993       1992       1991
                                                                   ---------  ---------  ---------
<S>                                                                <C>        <C>        <C>
Charges incurred.................................................  $    42.4  $    50.4  $    49.3
</TABLE>
 
                                       20
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    TELECOMMUNICATIONS  PLANT--Telecommunications  plant is  stated  at original
cost. The original cost of telecommunications plant acquired from ASI includes a
return on investment to ASI.
 
    The provision for  depreciation is  based principally  on the  straight-line
remaining  life and the  straight-line equal life  group methods of depreciation
applied to  individual  categories  of  telecommunications  plant  with  similar
characteristics.
 
    Generally, when depreciable plant is retired, the amount at which such plant
has   been  carried  in  telecommunications  plant  in  service  is  charged  to
accumulated depreciation.
 
    The cost of maintenance and repairs of plant is charged to expense.
 
    INVESTMENTS--The Company's investment in ASI  (33% ownership and $84.6)  and
IBAC's  investment in a  real estate venture (26.4%  ownership) are reflected in
the consolidated financial statements using the equity method of accounting.
 
    MATERIAL AND SUPPLIES--Inventories of new and reusable material and supplies
are stated at the lower of cost  or market with cost determined generally on  an
average cost basis.
 
    INTEREST  DURING CONSTRUCTION--Regulatory  authorities allow  the Company to
accrue interest  as a  cost of  constructing certain  plant and  as an  item  of
income,  i.e., allowance for debt and equity funds used to finance construction.
Such income is  not realized in  cash currently  but will be  realized over  the
service  life  of the  plant  as the  resulting  higher depreciation  expense is
recovered in the form of increased revenues.
 
    INCOME TAXES--The Company is included in the consolidated federal income tax
return filed by Ameritech and its  subsidiaries. Effective January 1, 1993,  the
Company  adopted SFAS No. 109, "Accounting for Income Taxes." The new accounting
method is essentially a refinement of  the liability method already followed  by
the Company and, accordingly, did not have a significant impact on the Company's
financial  statements upon  adoption. Consolidated income  tax currently payable
has been  allocated  to the  Company  based  on the  Company's  contribution  to
consolidated taxable income and tax credits.
 
    Deferred  tax assets  and liabilities are  based on  differences between the
financial statement bases of assets and  liabilities and the tax bases of  those
same assets and liabilities. Under the liability method, deferred tax assets and
liabilities  at the end  of each period  are determined using  the statutory tax
rates in  effect  when these  temporary  differences are  expected  to  reverse.
Deferred income tax expense is measured by the change in the net deferred income
tax  asset or liability  during the year. In  addition, for regulated companies,
SFAS No. 109 requires that all deferred regulatory liabilities be recognized  at
the revenue requirement level. It further requires that a deferred tax liability
be  recorded to reflect the amount  of cumulative tax benefits previously flowed
through to ratepayers and that a long-term deferred asset be recorded to reflect
the revenue to  be recovered in  telephone rates when  the related taxes  become
payable in future years.
 
    The  Company  uses  the deferral  method  of accounting  for  investment tax
credits. Therefore, credits earned prior to the repeal of investment tax credits
by the Tax Reform Act of 1986 and also certain transitional credits earned after
the repeal are being amortized as reductions in tax expense over the life of the
plant which gave rise to the credits.
 
    TEMPORARY CASH INVESTMENTS--Temporary  cash investments are  stated at  cost
which  approximates market. The Company  considers all highly liquid, short-term
investments with  an  original maturity  of  three months  or  less to  be  cash
equivalents.
 
                                       21
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    SHORT-TERM  FINANCING  ARRANGEMENT--During 1991,  Ameritech entered  into an
arrangement with its subsidiaries, including  the Company, for the provision  of
short-term  financing and cash management  services. Ameritech issues commercial
paper and notes and secures bank  loans to fund the working capital  requirement
of  its subsidiaries and  invests short-term, excess funds  on their behalf. See
Notes D and H.
 
    B. INCOME TAXES
 
The components of income tax expense follows:
 
<TABLE>
<CAPTION>
                                                                              1993       1992       1991
                                                                            ---------  ---------  ---------
<S>                                                                         <C>        <C>        <C>
Federal
  Current.................................................................  $   176.1  $   178.8  $   159.4
  Deferred--net...........................................................       17.0       19.7      (11.9)
  Investment tax credits--net.............................................      (18.2)     (18.5)     (24.2)
                                                                            ---------  ---------  ---------
        Total.............................................................      174.9      180.0      123.3
                                                                            ---------  ---------  ---------
State and local
  Current.................................................................       35.7       17.4       40.7
  Deferred-net............................................................       10.3        4.0        2.7
                                                                            ---------  ---------  ---------
        Total.............................................................       46.0       21.4       43.4
                                                                            ---------  ---------  ---------
Total income tax expense..................................................  $   220.9  $   201.4  $   166.7
                                                                            ---------  ---------  ---------
                                                                            ---------  ---------  ---------
</TABLE>
 
    Deferred income  tax expense  (credits) results  principally from  temporary
differences caused by the change in the book and tax bases of telecommunications
plant  due to the use of different  depreciation methods and lives for financial
reporting and income tax purposes. Total  income taxes paid were $231.9,  $224.3
and $171.1 in 1993, 1992 and 1991, respectively.
 
    The  following is a reconciliation between  the statutory federal income tax
rate for each of the  past three years and  the Company's overall effective  tax
rate:
 
<TABLE>
<CAPTION>
                                                                                  1993     1992     1991
                                                                                 ------    -----    ----
<S>                                                                              <C>       <C>      <C>
Statutory federal income tax rate.............................................    35.0%    34.0%    34.0%
  State income taxes, net of federal benefit..................................     4.7      2.3      5.5
  Reduction in tax expense due to amortization of investment tax credits......    (2.8)    (3.0)    (4.7)
  Effect of adjusting deferred income tax balances due to tax law changes.....    (1.4)    --       --
  Benefit of tax rate differential applied to reversing temporary
   differences................................................................    (1.8)    (2.2)    (3.4)
  Other.......................................................................     0.9      1.7      0.7
                                                                                 ------    -----    ----
Effective overall income tax rate.............................................    34.6%    32.8%    32.1%
                                                                                 ------    -----    ----
                                                                                 ------    -----    ----
</TABLE>
 
    The  Revenue Reconciliation Act  of 1993, enacted  in August 1993, increased
the statutory federal income tax rate for 1993 to 35 percent. In accordance with
the liability method of accounting, the Company adjusted, on the enactment date,
its deferred income tax balances not subject to regulatory accounting prescribed
by SFAS No. 71 (see Note A). The  result was a reduction in deferred income  tax
expense  of $8.9, primarily  from increasing the  deferred tax assets associated
with SFAS Nos. 106 and 112 (see Note C).
 
    As of  December 31,  1993, the  Company  had a  regulatory asset  of  $160.5
(reflected  primarily  in  Other Assets  and  Deferred Charges)  related  to the
cumulative amount  of income  taxes on  temporary differences  on benefits  that
previously  flowed through  to the  ratepayers. In  addition, on  that date, the
 
                                       22
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
Company had  a  regulatory liability  of  $227.9 (reflected  in  Other  Deferred
Credits) related to the reduction of deferred taxes resulting from the change in
the  federal statutory income tax rate to 35 percent and deferred taxes provided
on unamortized investment tax credits. These amounts will be amortized over  the
regulatory  lives of the related depreciable  assets concurrent with recovery in
rates. The accounting for and the impact  on future net income of these  amounts
will  depend  on  the  ratemaking  treatment  authorized  in  future  regulatory
proceedings.
 
    As of December  31, 1993 and  1992 the components  of long-term  accumulated
deferred income taxes were as follows:
 
<TABLE>
<CAPTION>
                                                                                                1993       1992
                                                                                             ----------  ---------
<S>                                                                                          <C>         <C>
Deferred tax assets
  Postretirement and postemployment benefits...............................................  $    332.8  $   351.8
  SFAS No. 71 accounting...................................................................        57.8       82.5
  Other, net...............................................................................        35.1       30.0
                                                                                             ----------  ---------
                                                                                             $    425.7  $   464.3
                                                                                             ----------  ---------
Deferred tax liabilities
  Accelerated depreciation.................................................................  $    939.9  $   935.8
  Other....................................................................................        72.9       61.1
                                                                                             ----------  ---------
                                                                                             $  1,012.8  $   996.9
                                                                                             ----------  ---------
Net deferred tax liability.................................................................  $    587.1  $   532.6
                                                                                             ----------  ---------
                                                                                             ----------  ---------
</TABLE>
 
    Deferred  income taxes  in current assets  and liabilities are  not shown as
they are not significant.
 
    C. EMPLOYEE BENEFIT PLANS
 
    PENSION PLANS--Ameritech maintains noncontributory defined pension and death
benefit plans covering substantially all of the Company's employees. The pension
benefit formula  used in  the determination  of  pension cost  is based  on  the
average  compensation earned  during the five  highest consecutive  years of the
last ten years of employment  for the management plan  and a flat dollar  amount
per  year of service for the nonmanagement  plan. Pension credit is allocated to
subsidiaries based upon the percentage  of compensation for the management  plan
and  per employee for the nonmanagement plan. The Company's funding policy is to
contribute annually an amount up to the maximum amount that can be deducted  for
federal  income tax purposes. However, due to the funded status of the plans, no
contributions have been made  for the years reported  below. The following  data
provides information on the Company's credit for the Ameritech plans:
 
<TABLE>
<CAPTION>
                                                                                          1993           1992           1991
                                                                                        ---------      ---------      ---------
<S>                                                                                     <C>            <C>            <C>
Pension credit.....................................................................     $ (33.9)       $ (37.7)       $ (26.2)
                                                                                        ---------      ---------      ---------
                                                                                        ---------      ---------      ---------
Current year credit as a percent of salaries and wages.............................         (4.60)%        (5.04)%        (3.34)%
                                                                                        ---------      ---------      ---------
                                                                                        ---------      ---------      ---------
</TABLE>
 
    Pension  credits were determined  using the projected  unit credit actuarial
method in accordance with SFAS No. 87, "Employers' Accounting for Pensions." The
resulting pension  credits are  primarily attributable  to favorable  investment
performance and the funded status of the plans.
 
    Certain  disclosures are  required to be  made of the  components of pension
credit and the funded status of the plans, including the actuarial present value
of accumulated plan benefits, accumulated  projected benefit obligation and  the
fair  value of plan assets.  Such disclosures are not  presented for the Company
because the structure of the Ameritech plans does not permit the plans' data  to
be readily disaggregated.
 
                                       23
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    The  assets of  the Ameritech plans  consist principally of  debt and equity
securities, fixed income investments and real  estate. As of December 31,  1993,
the fair value of plan assets available for plan benefits exceeded the projected
benefit  obligation  (calculated using  a  discount rate  of  5.8 percent  as of
December 31, 1993 and 1992). The assumed long-term rate of return on plan assets
used in determining pension income was 7.25 percent for 1993, 1992 and 1991. The
assumed rate of increase in future compensation levels for management, also used
in the determination  of the projected  benefit obligation, was  4.5 percent  in
1993 and 1992.
 
    POSTRETIREMENT  BENEFITS OTHER THAN PENSIONS--Effective January 1, 1992, the
Company adopted SFAS No. 106, "Employers' Accounting for Postretirement Benefits
Other Than Pensions". SFAS No. 106 requires the cost of postretirement  benefits
granted  to employees  to be  accrued as  expense over  the period  in which the
employee renders service and becomes eligible  to receive benefits. The cost  of
postretirement  health care and  life insurance benefits  for current and future
retirees was recognized as determined under the projected unit credit  actuarial
method.
 
    In  adopting  SFAS No.  106, the  Company  elected to  immediately recognize
effective January  1, 1992,  the transition  obligation for  current and  future
retirees.  The transition  obligation was $867.6  less deferred  income taxes of
$336.8 or $530.8,  net. To this  amount, was  added the Company's  33% share  of
ASI's transition obligation of $20.4 for a total charge of $551.2.
 
    As  defined  by  SFAS  No.  71, a  regulatory  asset  and  any corresponding
regulatory  liability  associated  with   the  recognition  of  the   transition
obligation was not recorded because of uncertainties as to the timing and extent
of recovery in the rate-making process.
 
    Substantially   all   current  and   future   retirees  are   covered  under
postretirement benefit  plans  sponsored  by Ameritech.  Such  benefits  include
medical,  dental  and  group  life  insurance.  Ameritech  has  been  prefunding
(including cash received  from the  Company) certain of  these benefits  through
Voluntary  Employee  Benefit Association  trust  funds ("VEBAs")  and Retirement
Funding Accounts  ("RFAs").  The  associated plan  assets  (primarily  corporate
securities  and bonds) were considered  in determining the transition obligation
under SFAS  No.  106. Ameritech  intends  to  continue to  fund  its  obligation
appropriately,  and is  exploring other  available funding  and cost containment
alternatives. Ameritech  allocates  its  retiree  health  care  cost  on  a  per
participant   basis,  whereas  group  life   insurance  is  allocated  based  on
compensation levels.
 
    SFAS  No.  106  requires  certain  disclosures  as  to  the  components   of
postretirement   benefit  costs  and  the  funded  status  of  the  plans.  Such
disclosures are not presented for the Company as the structure of the  Ameritech
plans does not permit the data to be readily disaggregated.
 
    However,  the  Company has  been advised  by Ameritech  as to  the following
assumptions used in determining SFAS No. 106 costs.
 
    As of December  31, 1993 the  accumulated postretirement benefit  obligation
exceeded  the fair value of plan assets available for plan benefits. The assumed
discount rate used to measure the accumulated postretirement benefit  obligation
was 7.0 percent as of December 31, 1993 and 7.5 percent as of December 31, 1992.
The  assumed rate of future increases in  compensation levels was 4.5 percent as
of December  31, 1993  and December  31, 1992.  The expected  long-term rate  of
return on plan assets was 7.25 percent in 1993 and 1992 on VEBAs and 8.0 percent
in  1993 and 1992 on RFAs.  The assumed health care cost  trend rate in 1993 was
9.6 percent and 10 percent  in 1992, and is assumed  to decrease gradually to  4
percent  in 2007 and  remain at that  level. The assumed  health care cost trend
rate is 9.2 percent for  1994. The health care  cost trend rate has  significant
effect on the amounts reported for costs each year. Specifically, increasing the
assumed  health care cost trend rates by one percentage point in each year would
increase the 1993 annual expense by approximately 18 percent.
 
                                       24
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    Postretirement benefit cost under SFAS No.  106 for 1993 and 1992 was  $84.7
and  $79.8, respectively.  During 1991, the  cost of  postretirement health care
benefits for retirees was $83.8.
 
    As of  December 31,  1993,  the Company  had approximately  15,369  retirees
eligible to receive health care and group life insurance benefits.
 
    POSTEMPLOYMENT BENEFITS--Effective January 1, 1992, the Company adopted SFAS
No.  112,  "Employers  Accounting  for Postemployment  Benefits".  SFAS  No. 112
requires employers to accrue the future cost of certain benefits such as workers
compensation, disability  benefits  and  health care  continuation  coverage.  A
one-time charge related to adoption of this statement was recognized as a change
in  accounting principle, effective as of January 1, 1992. The charge was $60.2,
less deferred taxes of $23.4, for a net of $36.8. To this amount, was added  the
Company's  33% share  of ASI's  one-time charge  of $0.6  for a  total charge of
$37.4. Previously the Company  used the cash method  to account for such  costs.
Current  expense levels are dependent upon  actual claim experience, but are not
materially different than prior charges to income.
 
    WORKFORCE REDUCTIONS--During 1993, 1,226 employees left the Company  through
voluntary   and  involuntary  termination   programs.  The  programs,  including
termination benefits, settlement  and curtailment gains  from the pension  plan,
resulted  in  a credit  to  expense of  $5.4.  The involuntary  termination plan
remains in effect until December 31, 1994.
 
    During 1992,  676  employees left  the  Company through  a  voluntary  early
retirement  program and  involuntary terminations. The  net cost  of this effort
including termination  benefits,  settlement  and  curtailment  gains  from  the
pension plan, was a credit to expense of $4.9.
 
    During  1991, the Company offered most  of its management employees an early
retirement program. The net cost of this program, including termination benefits
and a settlement gain from the pension plan, was $1.2.
 
    D. DEBT MATURING WITHIN ONE YEAR--Debt maturing within one year is  included
as  debt in the computation  of debt ratios and consists  of the following as of
December 31:
 
<TABLE>
<CAPTION>
                                                                                                      WEIGHTED
                                                                                                      AVERAGE
                                                                          AMOUNTS                 INTEREST RATES*
                                                               -----------------------------    --------------------
                                                                1993       1992       1991      1993    1992    1991
                                                               -------    -------    -------    ----    ----    ----
<S>                                                            <C>        <C>        <C>        <C>     <C>     <C>
Notes payable--Ameritech....................................   $ 494.2    $ 275.7    $ 245.0     3.2%    3.4%    5.1%
Long-term debt maturing within one year.....................     100.3        1.5        2.1
                                                               -------    -------    -------
    Total...................................................   $ 594.5    $ 277.2    $ 247.1
                                                               -------    -------    -------
                                                               -------    -------    -------
Average notes payable outstanding during the year...........   $ 292.7    $ 197.3    $ 236.4     3.1%    3.9%    5.9%
                                                               -------    -------    -------    ----    ----    ----
                                                               -------    -------    -------    ----    ----    ----
Maximum notes payable at any month end during the year......   $ 564.4    $ 277.5    $ 298.0
                                                               -------    -------    -------
                                                               -------    -------    -------
<FN>
- ---------
*Computed by dividing the  average daily face amount  of notes payable into  the
 aggregate related interest expense.
</TABLE>
 
    On  January  12, 1994,  the  Company redeemed  all  $300.0 of  the principal
amounts outstanding on its 8% debentures,  due December 4, 2004. The  redemption
was made pursuant to a call made by the Company in December 1993. The debentures
were  redeemed  at 101.85%  plus interest  accrued to  the redemption  date. The
redemption was financed with short-term debt. Expenses associated with this call
were $6.5, including  a call  premium of $5.6.  These expenses  are recorded  as
other expense (income)-net.
 
                                       25
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    At  December  31,  1993,  $200.0  of  debt  maturing  within  one  year  was
reclassified to long-term debt to reflect  the Company's debt offerings made  on
January  28,  1994. The  debt sold  included  $100.0 debentures  at 6  5/8%, due
February 1,  2025 (noncallable  until 2004)  and  $100.0 notes  at 5  4/5%,  due
February  1, 2004. The long-term debt issues,  settled in February 1994, will be
used to repay notes payable outstanding. These amounts have been included in the
Company's long-term debt. See Note E.
 
    At December 31, 1993 debt maturing  within one year reflects the  redemption
of  the  $300.0 debentures,  net of  the $200.0  of debt  offerings made  by the
Company.
 
    During  1991  Ameritech  consolidated   the  short-term  financing  of   its
subsidiaries   at   Ameritech  Corporate.   See  Note   A--SHORT-TERM  FINANCING
ARRANGEMENTS.
 
    E. LONG-TERM DEBT--Long-term debt consists principally of mortgage bonds and
debentures issued by the Company.
 
    The following  table sets  forth  interest rates  and other  information  on
long-term  debt  outstanding  at  December  31,  after  giving  effect  to  debt
refinanced in January 1994.
 
<TABLE>
<CAPTION>
                                                      1993          1992
                                                    ---------     ---------
<S>                                                 <C>           <C>
First Mortgage bonds:
  Series D, 3 1/4%, due July 15, 1995.............  $     30.0    $     30.0
  Series G, 4 7/8%, due July 1, 1997..............        50.0          50.0
  Series H, 4 3/8%, due July 1, 2003..............        50.0          50.0
  Series I, 6%, due July 1, 1998..................     --              125.0
  Series J, 8%, due June 1, 2005..................     --              150.0
  Series K, 7 5/8%, due April 1, 2006.............       200.0         200.0
Thirty-one year 8% debentures, due December 10,
  2004............................................     --              300.0
Forty year 8 1/4% debentures, due August 18,
  2016............................................     --              175.0
Forty year 8 1/2% debentures, due April 22,
  2026............................................       275.0         275.0
Thirty-one year 7 1/4% debentures, due March 15,
  2024............................................       200.0       --
Thirty year 7 1/8% debentures, due July 1, 2023...       100.0       --
Thirty-one year debentures, 6 5/8% due February 1,
  2025............................................       100.0*      --
Ten year notes, 5 4/5% due February 1, 2004.......       100.0*      --
Long-term capital lease obligations...............         5.8           7.0
                                                    ---------     ---------
                                                    $  1,110.8    $  1,362.0
Unamortized discount--net.........................       (33.8)        (31.9)
                                                    ---------     ---------
      Total.......................................  $  1,077.0    $  1,330.1
                                                    ---------     ---------
                                                    ---------     ---------
<FN>
- ---------
*See Note D.
</TABLE>
 
    On March 26, 1993, the Company issued $200.0 of 7 1/4% debentures, due March
15, 2024. On July 6, 1993, the  Company issued $100.0 of 7 1/8% debentures,  due
July  1, 2023.  The proceeds  from these issues  were used  to repay outstanding
notes payable.
 
    On August 9, 1993, the Company redeemed all $150.0 of the principal  amounts
outstanding on its 8%, Series J mortgage bonds, due June 1, 2005. The debentures
were redeemed at 101.75%. Expenses associated with this call, net of unamortized
premium amounts, were $2.2, including a call premium of $2.6.
 
    On  September  1, 1993,  the Company  redeemed all  $125.0 of  the principal
amounts outstanding on its 6%,  Series I mortgage bonds,  due July 1, 1998.  The
debentures  were redeemed at par value.  Expenses associated with this call were
$0.2.
 
                                       26
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    On  October  12, 1993,  the  Company redeemed  all  $175.0 of  the principal
amounts on  its  forty-year,  8  1/4%  debentures,  due  August  18,  2016.  The
debentures  were redeemed  at 104.24%  plus interest  accrued to  the redemption
date. Expenses associated with this call were $8.5, including a call premium  of
$7.4.
 
    On  January  12, 1994,  the  Company redeemed  all  $300.0 of  the principal
amounts on  its thirty-one  year,  8% debentures,  due  December 10,  2004.  The
debentures  were redeemed  at 101.85%  plus interest  accrued to  the redemption
date. Expenses associated with this call, recorded in 1993, were $6.5, including
a call premium of $5.6. See Note D.
 
    On February  4,  1994, the  Company  issued  debt of  $200.0.  These  issues
included  $100.0 debentures at  6 5/8%, due February  1, 2025 (noncallable until
2004) and $100.0 notes at 5 4/5%, due February 1, 2004. The proceeds from  these
issues will be used to repay notes payable outstanding. See Note D.
 
    On  August 17,  1993, the  Company filed  a registration  statement with the
Securities and Exchange  Commission for issuance  of up to  $550.0 in  unsecured
debt  securities  to  be  used  to  retire  long-term  indebtedness.  Debt  sold
subsequent to year end  of $200.0 reduced the  available securities that can  be
offered.
 
    Early  extinguishment of debt costs  (including call premiums and write-offs
of unamortized deferred costs) were $17.4 in 1993 and zero in 1992 and 1991, and
were included in other expense (income) on the statements of income.
 
    Substantially all telecommunications plant owned  by the Company is  subject
to lien under the indenture covering first mortgage bonds.
 
    F.  LEASE COMMITMENTS--The  Company leases certain  facilities and equipment
used in its operations under both  operating and capital leases. Rental  expense
under  operating leases  was $32.3,  $36.9 and  $32.6 for  1993, 1992  and 1991,
respectively. At  December 31,  1993 the  aggregate minimum  rental  commitments
under noncancelable leases were approximately as follows:
 
<TABLE>
<CAPTION>
YEARS                                                   OPERATING     CAPITAL
- -----------------------------------------------------  -----------  -----------
<S>                                                    <C>          <C>
1994.................................................   $     7.7    $      2.0
1995.................................................         9.2           1.9
1996.................................................         6.7           1.7
1997.................................................         6.6           1.3
1998.................................................         6.5           0.7
Thereafter...........................................        52.9           2.9
                                                          -----         -----
Total minimum lease commitments......................   $    89.6          10.5
                                                          -----
                                                          -----
Less: executory costs.............................................          0.7
     interest costs...............................................          2.8
                                                                        -----
Present value of minimum lease payments...........................   $      7.0
                                                                        -----
                                                                        -----
</TABLE>
 
                                       27
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    G.  FINANCIAL INSTRUMENTS--The  following table presents  the estimated fair
value of the Company's financial instruments as of December 31, 1993 and 1992:
 
<TABLE>
<CAPTION>
                                                                      1993
                                                             ----------------------
                                                              CARRYING
                                                               VALUE     FAIR VALUE
                                                             ----------  ----------
<S>                                                          <C>         <C>
Cash and temporary cash investments........................  $     14.7  $     14.7
Debt.......................................................     1,670.9     1,690.1
Long-term payable to ASI (for postretirement benefits).....        30.9        30.9
Other assets...............................................        11.2        11.2
Other liabilities..........................................        15.3        15.3
</TABLE>
 
<TABLE>
<CAPTION>
                                                                      1992
                                                             ----------------------
                                                              CARRYING
                                                               VALUE     FAIR VALUE
                                                             ----------  ----------
<S>                                                          <C>         <C>
Cash and temporary cash investments........................  $     17.6  $     17.6
Debt.......................................................     1,622.0     1,639.0
Long-term payable to ASI (for postretirement benefits).....        32.7        32.7
Other assets...............................................         9.3         9.3
Other liabilities..........................................        12.9        12.9
</TABLE>
 
    The following methods and assumptions were  used to estimate the fair  value
of financial instruments:
 
    CASH  AND TEMPORARY  CASH INVESTMENTS--The carrying  value approximates fair
value because of short-term maturity of these instruments.
 
    DEBT--The carrying amount (including accrued interest) of the Company's debt
maturing within  one year  approximates  fair value  because of  the  short-term
maturities  involved.  The  fair  value  of  the  Company's  long-term  debt was
estimated based on  the year-end  quoted market price  for the  same or  similar
issues.
 
    OTHER  ASSETS AND LIABILITIES--These financial instruments consist primarily
of long-term receivables,  other investments, financial  contracts and  customer
deposits. The fair values of these items are based on expected cash flows or, if
available, quoted market prices.
 
    LONG-TERM  PAYABLE  TO  ASI  (FOR  POSTRETIREMENT  BENEFITS)--Carrying value
approximates fair value.
 
                                       28
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    H. ADDITIONAL FINANCIAL INFORMATION
 
<TABLE>
<CAPTION>
                                                                                   DECEMBER 31,
                                                                               --------------------
                                                                                 1993       1992
                                                                               ---------  ---------
<S>                                                                            <C>        <C>        <C>
CONSOLIDATED BALANCE SHEETS
  Other current liabilities:
    Accrued payroll..........................................................  $    23.1  $    21.8
    Compensated absences.....................................................       61.0       58.1
    Accrued taxes............................................................       63.0       84.2
    Income taxes deferred one year...........................................      (38.6)     (65.2)
    Advance billings and customer deposits...................................      141.0      135.2
    Dividend payable.........................................................      106.3       92.7
    Accrued interest.........................................................       27.2       20.8
    Other....................................................................       21.6       46.6
                                                                               ---------  ---------
        Total................................................................  $   404.6  $   394.2
                                                                               ---------  ---------
                                                                               ---------  ---------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                 1993       1992       1991
                                                                               ---------  ---------  ---------
<S>                                                                            <C>        <C>        <C>
CONSOLIDATED STATEMENTS OF INCOME
  Interest expense:
    Interest on long-term debt...............................................  $   106.1  $   104.7  $   105.4
    Interest on notes payable--Ameritech.....................................        9.2        7.8       14.0
    Interest on capital leases...............................................        0.8        1.1        1.1
    Other....................................................................        3.8        0.6       11.0
                                                                               ---------  ---------  ---------
        Total................................................................  $   119.9  $   114.2  $   131.5
                                                                               ---------  ---------  ---------
                                                                               ---------  ---------  ---------
</TABLE>
 
    Interest paid  was  $113.6,  $134.8  and $121.3  in  1993,  1992  and  1991,
respectively.
 
<TABLE>
<CAPTION>
                                                                                 1993       1992       1991
                                                                               ---------  ---------  ---------
<S>                                                                            <C>        <C>        <C>
 Taxes other than income taxes
    Property.................................................................  $    33.5  $    28.6  $    32.4
    Gross receipts...........................................................       27.2       29.7       53.8
    Other....................................................................       26.5       32.9       32.2
                                                                               ---------  ---------  ---------
        Total................................................................  $    87.2  $    91.2  $   118.4
                                                                               ---------  ---------  ---------
                                                                               ---------  ---------  ---------
Maintenance and repair expense...............................................  $   617.8  $   598.5  $   560.3
                                                                               =========  =========  =========
Advertising expenses.........................................................  $    36.6  $    22.8  $    19.8
                                                                               =========  =========  ========= 

Depreciation-Percentage of average depreciable telecommunications
  equipment..................................................................        6.3%       6.5%       6.5%
                                                                               =========  =========  =========
</TABLE>
 
    Revenues  from AT&T, consisting principally of interstate network access and
billing and collection  service revenues, comprised  approximately 12%, 14%  and
15%,  of total revenues in 1993, 1992  and 1991, respectively. No other customer
accounted for more than 10% of total revenues.
 
                                       29
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
    I. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                                NET
                                                                                 OPERATING    INCOME
                         CALENDAR QUARTER                            REVENUES     INCOME      (LOSS)
                          -------------                             ----------  -----------   -------
<S>                                                                 <C>         <C>           <C>
                               1993
- ------------------------------------------------------------------
  1st ............................................................  $    730.5   $   169.9    $  90.9
  2nd.............................................................       763.0       205.5      114.1
  3rd.............................................................       768.2       192.3      102.1
  4th.............................................................       779.3       200.2      110.1
                                                                    ----------  -----------   -------
        Total.....................................................  $  3,041.0   $   767.9    $ 417.2
                                                                    ----------  -----------   -------
                                                                    ----------  -----------   -------
                               1992
- ------------------------------------------------------------------
  1st ............................................................  $    720.0   $   162.0    $(497.5)
  2nd.............................................................       736.8       181.0       99.0
  3rd.............................................................       740.0       183.2      101.3
  4th.............................................................       749.6       207.6      122.0
                                                                    ----------  -----------   -------
        Total.....................................................  $  2,946.4   $   733.8    $(175.2)
                                                                    ----------  -----------   -------
                                                                    ----------  -----------   -------
</TABLE>
 
    The fourth  quarter of  1993 and  1992 was  affected by  several income  and
expense  items. The fourth quarter of 1993  was affected by gains from workforce
resizing and charges for the early retirement of debt. In the 1992 quarter,  the
Company   recognized  higher  costs  and   charges  resulting  from  its  market
realignment efforts. These costs were  offset by gains resulting from  workforce
resizing and higher than expected pension credits.
 
    First  quarter 1992 results reflect charges  related to the adoption of SFAS
Nos. 106 and 112  for postretirement and  postemployment benefits, as  discussed
previously in Note C. The charges totaled $588.6.
 
    All  adjustments necessary for  a fair statement of  results for each period
have been included.
 
    J. CALCULATION OF RATIO OF EARNINGS TO FIXED CHARGES
 
    The ratio of earnings  to fixed charges  of the Company  for the five  years
ended  December 31, 1993, 1992, 1991, 1990,  and 1989 was 5.88, 5.86, 4.65, 5.28
and 5.01, respectively.
 
    For the purpose of calculating this ratio, (i) earnings have been calculated
by adding to income before interest  expense and accounting changes, the  amount
of  related taxes  on income  and the portion  of rentals  representative of the
interest factor, (ii) the  Company considers one-third of  rental expense to  be
the  amount representing  return on  capital, and  (iii) fixed  charges comprise
total interest expense and such portion of rentals.
 
K. EVENT SUBSEQUENT TO DATE OF AUDITORS' REPORT (UNAUDITED)
 
    On March 25,  1994, Ameritech  announced it would  reduce its  nonmanagement
workforce  resulting in an after-tax charge to  the Company of $83.0. The charge
will be recorded  in the first  quarter of 1994.  The details of  this plan  are
discussed on page 15 in MD&A.
 
<PAGE>
                        ILLINOIS BELL TELEPHONE COMPANY
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE.
 
    No changes in nor disagreements with accountants on any matter of accounting
principles  or practices,  financial statement  disclosure or  auditing scope or
procedure occurred during the period covered by this annual report.
 
                                    PART IV
 
ITEM 14. EXHIBITS; FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.
 
    (A) DOCUMENTS FILED AS PART OF THE REPORT:
 
        (1) FINANCIAL STATEMENTS:
 
<TABLE>
<CAPTION>
                                                                                              PAGE
                                                                                              -----
<S>                                                                                        <C>
Selected Financial and Operating Data....................................................          10
Report of Independent Public Accountants.................................................          16
Statements:
  Consolidated Statements of Income and Reinvested Earnings..............................          17
  Consolidated Balance Sheets............................................................          18
  Consolidated Statements of Cash Flows..................................................          19
  Notes to Consolidated Financial Statements.............................................          20
</TABLE>
 
        (2) FINANCIAL STATEMENT SCHEDULES:
 
<TABLE>
<S>                                                                      <C>
  V--Telecommunications Plant..........................................          33
 VI--Accumulated Depreciation..........................................          35
VIII--Allowance for Uncollectibles.....................................          37
</TABLE>
 
           Financial statement schedules other than those listed above have been
       omitted because the required information is contained in the consolidated
       financial statements and notes thereto, or because such schedules are not
       required or applicable.
 
        (3) EXHIBITS: See index on Page 38.
 
    (B) REPORTS ON FORM 8-K:
 
       On February 4, 1994, the Company filed a Current Report on Form 8-K dated
       February 4, 1994  to file pursuant  to Item 7,  Financial Statements  and
       Exhibits,  certain financial  information concerning the  Company and its
       subsidiary.
 
       On February 4, 1994, the Company filed a Current Report on Form 8-K dated
       January 28, 1994 to file pursuant to Item 5, Other Events, (a) copies  of
       an  Underwriting Agreement and a Pricing Agreement executed in connection
       with a  proposed offering  of  debentures by  the  Company to  be  issued
       pursuant  to the Registration  Statement on Form  S-3 (File No. 33-50007)
       filed by  the  Company  on August  17,  1993,  together with  a  form  of
       Officer's  Certificate and a  form of debentures  and (b) an Underwriting
       Agreement and a Pricing Agreement executed in connection with a  proposed
       offering   of  notes  by  the  Company  to  be  issued  pursuant  to  the
       Registration Statement, together with a form of Officer's Certificate and
       a form of notes.
 
                                       31
<PAGE>
                                   SIGNATURES
 
    Pursuant  to  the requirements  of  Section 13  or  15(d) of  the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                          ILLINOIS BELL TELEPHONE COMPANY
 
                                          By _______/S/_RICHARD A. KUZMAR_______
                                                     Richard A. Kuzmar
                                                VICE PRESIDENT -- CONTROLLER
 
March 30, 1994
 
    Pursuant to the requirements  of the Securities Exchange  Act of 1934,  this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
registrant and in the capacities and on the date indicated.
 
PRINCIPAL EXECUTIVE OFFICER:
 
      _____/S/_DOUGLAS L. WHITLEY_____
            Douglas L. Whitley
                PRESIDENT
 
PRINCIPAL FINANCIAL AND ACCOUNTING
OFFICER:
 
      ______/S/_RICHARD A. KUZMAR_____
          Richard A. Kuzmar
       VICE PRESIDENT -- CONTROLLER
 
    Ameritech Corporation
 
    By ______/S/_RICHARD H. BROWN_____
              Richard H. Brown
               VICE CHAIRMAN
 
    The  sole   shareholder   of   the
    registrant,  which is  a statutory
    close corporation  managed by  the
    shareholder rather than by a board
    of directors.
 
March 30, 1994
 
                                       32
<PAGE>
                                                             SCHEDULE V--SHEET 1
 
                        ILLINOIS BELL TELEPHONE COMPANY
                      SCHEDULE V--TELECOMMUNICATIONS PLANT
                             (DOLLARS IN MILLIONS)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                      COL. A                           COL. B      COL. C       COL. D       COL. E        COL. F
                  -------------                      ----------   ---------    --------    ----------    ----------
                                                     BALANCE AT   ADDITIONS                              BALANCE AT
                                                     BEGINNING       AT        RETIRE-       OTHER         END OF
                  CLASSIFICATION                     OF PERIOD     COST(A)     MENTS(B)    CHANGES(C)      PERIOD
- --------------------------------------------------   ----------   ---------    --------    ----------    ----------
<S>                                                  <C>          <C>          <C>         <C>           <C>
                    YEAR 1993
Land..............................................   $    37.4    $    0.5     $    --     $      --     $    37.9
Buildings.........................................       727.4        24.7         3.9            --         748.2
Computer and Other Office Equipment...............       402.0        12.8        74.3            --         340.5
Vehicles and Other Work Equipment.................       210.8        18.2         6.5            --         222.5
Central Office Equipment..........................     3,098.2       316.9       327.1          (1.0)      3,087.0
Information Origination/Termination Equipment.....       305.4        20.6         2.9           1.0         324.1
Cable and Wire Facilities.........................     3,207.1       164.1        48.5            --       3,322.7
Capitalized Lease Assets..........................        17.8          --         1.5            --          16.3
Miscellaneous Other Property......................        15.4          --        (0.5)           --          15.9
                                                     ----------   ---------    --------        -----     ----------
    Total telecommunications plant in service.....     8,021.5       557.8       464.2            --       8,115.1
    Telecommunications plant under construction...       116.5        (7.9)         --            --         108.6
                                                     ----------   ---------    --------        -----     ----------
            TOTAL TELECOMMUNICATIONS PLANT........   $ 8,138.0    $  549.9     $ 464.2     $      --     $ 8,223.7
                                                     ----------   ---------    --------        -----     ----------
                                                     ----------   ---------    --------        -----     ----------
                    YEAR 1992
Land..............................................   $    37.4    $     --     $    --     $      --     $    37.4
Buildings.........................................       711.3        21.1         5.0            --         727.4
Computer and Other Office Equipment...............       416.7        22.5        37.2            --         402.0
Vehicles and Other Work Equipment.................       201.9        15.0         6.1            --         210.8
Central Office Equipment..........................     3,092.5       268.7       262.9          (0.1)      3,098.2
Information Origination/Termination Equipment.....       293.9        17.4         6.0           0.1         305.4
Cable and Wire Facilities.........................     3,060.7       184.0        37.6            --       3,207.1
Capitalized Lease Assets..........................        19.2         1.0         2.4            --          17.8
Miscellaneous Other Property......................        15.4          --          --            --          15.4
                                                     ----------   ---------    --------        -----     ----------
    Total telecommunications plant in service.....     7,849.0       529.7       357.2            --       8,021.5
    Telecommunications plant under construction...        60.9        55.9         0.3            --         116.5
                                                     ----------   ---------    --------        -----     ----------
            TOTAL TELECOMMUNICATIONS PLANT........   $ 7,909.9    $  585.6     $ 357.5     $      --     $ 8,138.0
                                                     ----------   ---------    --------        -----     ----------
                                                     ----------   ---------    --------        -----     ----------
</TABLE>
 
          The notes on Sheet 2 are an integral part of this Schedule.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                       33
<PAGE>
                                                             SCHEDULE V--SHEET 2
 
                        ILLINOIS BELL TELEPHONE COMPANY
                SCHEDULE V--TELECOMMUNICATIONS PLANT (CONTINUED)
                             (DOLLARS IN MILLIONS)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                      COL. A                           COL. B      COL. C       COL. D       COL. E        COL. F
                  -------------                      ----------   ---------    --------    ----------    ----------
                                                     BALANCE AT   ADDITIONS                              BALANCE AT
                                                     BEGINNING       AT        RETIRE-       OTHER         END OF
                  CLASSIFICATION                     OF PERIOD     COST(A)     MENTS(B)    CHANGES(C)      PERIOD
- --------------------------------------------------   ----------   ---------    --------    ----------    ----------
<S>                                                  <C>          <C>          <C>         <C>           <C>
                    YEAR 1991
Land..............................................   $    36.9    $    0.5     $    --     $      --     $    37.4
Buildings.........................................       678.2        41.4         8.3            --         711.3
Computer and Other Office Equipment...............       431.2        43.6        58.1            --         416.7
Vehicles and Other Work Equipment.................       194.3        24.7        17.1            --         201.9
Central Office Equipment..........................     2,965.2       325.3       197.6          (0.4)      3,092.5
Information Origination/Termination Equipment.....       283.4        15.5         5.8           0.8         293.9
Cable and Wire Facilities.........................     2,908.9       191.6        39.4          (0.4)      3,060.7
Capitalized Lease Assets..........................        17.8         2.4         1.0            --          19.2
Miscellaneous Other Property......................        15.2         0.2          --            --          15.4
                                                     ----------   ---------    --------        -----     ----------
    Total telecommunications plant in service.....     7,531.1       645.2       327.3            --       7,849.0
    Telecommunications plant under construction...       124.3       (63.5)       (0.1)           --          60.9
                                                     ----------   ---------    --------        -----     ----------
            TOTAL TELECOMMUNICATIONS PLANT........   $ 7,655.4    $  581.7     $ 327.2     $      --     $ 7,909.9
                                                     ----------   ---------    --------        -----     ----------
                                                     ----------   ---------    --------        -----     ----------
<FN>
- ---------
Notes:
(a)  Additions,  other  than  to  buildings,  include  material  purchased  from
     Ameritech Services, Inc., a centralized procurement subsidiary in which the
     Company has a 33% ownership interest (See Note A to Consolidated  Financial
     Statements.)  Additions shown also include (1) the original cost (estimated
     if not  known)  of  reused  material, which  is  concurrently  credited  to
     material and supplies and (2) interest during construction.
(b)  Items  of telecommunications plant  when retired or  sold are deducted from
     the property accounts  at the amounts  at which they  are included  therein
     (estimated if not known.)
(c)  Comprised principally of reclassifications between plant categories.
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                       34
<PAGE>
                                                            SCHEDULE VI--SHEET 1
 
                        ILLINOIS BELL TELEPHONE COMPANY
                     SCHEDULE VI--ACCUMULATED DEPRECIATION
                             (DOLLARS IN MILLIONS)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                COL. B          COL. C                                        COL. F
                                             -------------  --------------      COL. D          COL. E      -----------
                  COL. A                      BALANCE AT      ADDITIONS     ---------------  -------------  BALANCE AT
               -------------                 BEGINNING OF     CHARGED TO        RETIRE-          OTHER        END OF
              CLASSIFICATION                    PERIOD        EXPENSE(A)       MENTS(B)       CHANGES(C)      PERIOD
- -------------------------------------------  -------------  --------------  ---------------  -------------  -----------
<S>                                          <C>            <C>             <C>              <C>            <C>
                 YEAR 1993
Buildings..................................   $     209.5     $     20.4       $     8.4       $    (0.5)    $   221.0
Computer and Other Office Equipment........         184.5           54.2            73.1              --         165.6
Vehicles and Other Work Equipment..........          71.8           18.6             6.2              --          84.2
Central Office Equipment...................       1,264.8          254.2           320.5              --       1,198.5
Information Origination/ Termination
  Equipment................................         170.2           14.7             3.1              --         181.8
Cable and Wire Facilities..................       1,230.0          143.5            51.7              --       1,321.8
Capitalized Lease Assets...................           9.6            1.3             1.0              --           9.9
Miscellaneous Other Property...............           1.9             --              --             0.5           2.4
                                             -------------       -------         -------           -----    -----------
            TOTAL ACCUMULATED
              DEPRECIATION.................   $   3,142.3     $    506.9       $   464.0       $      --     $ 3,185.2
                                             -------------       -------         -------           -----    -----------
                                             -------------       -------         -------           -----    -----------
                 YEAR 1992
Buildings..................................   $     198.6     $     20.5       $     9.6       $      --     $   209.5
Computer and Other Office Equipment........         158.7           60.6            34.8              --         184.5
Vehicles and Other Work Equipment..........          61.8           17.9             7.9              --          71.8
Central Office Equipment...................       1,270.0          254.3           259.5              --       1,264.8
Information Origination/ Termination
  Equipment................................         162.0           13.4             5.2              --         170.2
Cable and Wire Facilities..................       1,135.3          141.0            46.3              --       1,230.0
Capitalized Lease Assets...................          10.0            1.9             2.3              --           9.6
Miscellaneous Other Property...............           1.9             --              --              --           1.9
                                             -------------       -------         -------           -----    -----------
            TOTAL ACCUMULATED
              DEPRECIATION.................   $   2,998.3     $    509.6       $   365.6       $      --     $ 3,142.3
                                             -------------       -------         -------           -----    -----------
                                             -------------       -------         -------           -----    -----------
</TABLE>
 
          The notes on Sheet 2 are an integral part of this Schedule.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                       35
<PAGE>
                                                            SCHEDULE VI--SHEET 2
 
                        ILLINOIS BELL TELEPHONE COMPANY
               SCHEDULE VI--ACCUMULATED DEPRECIATION (CONTINUED)
                             (DOLLARS IN MILLIONS)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                               COL. B          COL. C                                         COL. F
                                            -------------  ---------------      COL. D          COL. E      -----------
                  COL. A                     BALANCE AT       ADDITIONS     ---------------  -------------  BALANCE AT
              -------------                 BEGINNING OF     CHARGED TO         RETIRE-          OTHER        END OF
              CLASSIFICATION                   PERIOD        EXPENSE(A)        MENTS(B)       CHANGES(C)      PERIOD
- ------------------------------------------  -------------  ---------------  ---------------  -------------  -----------
<S>                                         <C>            <C>              <C>              <C>            <C>
                YEAR 1991
Buildings.................................   $     194.0      $    19.8        $    13.9       $    (1.3)    $   198.6
Computer and Other Office Equipment.......         150.5           62.1             53.9              --         158.7
Vehicles and Other Work Equipment.........          60.9           17.7             16.8              --          61.8
Central Office Equipment..................       1,204.0          250.3            182.0            (2.3)      1,270.0
Information Origination/ Termination
  Equipment...............................         154.8           12.3              4.7            (0.4)        162.0
Cable and Wire Facilities.................       1,045.3          133.5             43.5              --       1,135.3
Capitalized Lease Assets..................           9.2            1.7              0.9              --          10.0
Miscellaneous Other Property..............           1.9             --               --              --           1.9
                                            -------------       -------          -------           -----    -----------
            TOTAL ACCUMULATED
              DEPRECIATION................   $   2,820.6      $   497.4        $   315.7       $    (4.0)    $ 2,998.3
                                            -------------       -------          -------           -----    -----------
                                            -------------       -------          -------           -----    -----------
<FN>
- ---------
(a)  The  Company's  provision  for  depreciation is  based  principally  on the
     straight-line remaining life and the straight-line equal life group methods
     of depreciation  applied to  individual categories  of plant  with  similar
     characteristics.  The Company is  allowed by regulatory  authorities to use
     reserve deficiency  amortization in  conjunction  with the  remaining  life
     method.  For  years  1993,  1992  and  1991,  depreciation  expressed  as a
     percentage  of  average  depreciable  plant   was  6.3%,  6.5%  and   6.5%,
     respectively.
(b)  Amounts  include amortization  of undepreciated  balance and  retirement of
     investment in tools and  equipment costing less  than five hundred  dollars
     but  more than two hundred dollars for  items purchased prior to January 1,
     1989.
(c)  Includes  reclassifications   between  plant   accounts,  adjustments   for
     depreciation  expense previously  recorded in  other periods  and transfers
     from operating plant to non-operating plant.
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                       36
<PAGE>
                                                                   SCHEDULE VIII
 
                  SCHEDULE VIII--ALLOWANCE FOR UNCOLLECTIBLES
                             (DOLLARS IN MILLIONS)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         COL. C
                                                                  ---------------------
                                                       COL. B           ADDITIONS                           COL. E
                                                     ----------   ---------------------                   ----------
                      COL. A                         BALANCE AT   CHARGED   CHARGED TO       COL. D       BALANCE AT
                  -------------                      BEGINNING      TO         OTHER      -------------     END OF
                  CLASSIFICATION                     OF PERIOD    EXPENSE   ACCOUNTS(A)   DEDUCTIONS(B)     PERIOD
- --------------------------------------------------   ----------   -------   -----------   -------------   ----------
Year 1993.........................................   $   35.2     $ 31.2    $    55.3     $     85.0      $    36.7
<S>                                                  <C>          <C>       <C>           <C>             <C>
Year 1992.........................................       36.2       34.3         61.1           96.4           35.2
Year 1991.........................................       26.6       38.4         60.1           88.9           36.2
<FN>
- ---------
(a)   Includes amounts related  to interexchange carrier  receivables which  are
      being  billed by the Company and amounts previously written off which were
      credited directly to this account when recovered.
(b)   Amounts written off as uncollectible.
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                       37
<PAGE>
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER
- -----------
<C>          <S>
       *3a   --Articles of Incorporation of the registrant as amended and restated March 21, 1990 (Exhibit 3a to Form
               10-K for 1989, File No. 1-2222).
       *3b   --By-Laws  of the  registrant effective  March 21,  1990 (Exhibit  3b to  Form 10-K  for 1989,  File No.
               1-2222).
        4    --No instrument which defines the rights of holders of long and intermediate term debt of the registrant
               is filed herewith pursuant to Regulation S-K, Item 601(b)(4)(iii)(A). Pursuant to this regulation, the
               registrant hereby agrees to furnish a copy of any such instrument to the SEC upon request.
      *10a   --Reorganization and  Divestiture Agreement  among American  Telephone and  Telegraph Company,  American
               Information  Technologies Corporation (n/k/a  Ameritech Corporation) and  Affiliates dated November 1,
               1983 (Exhibit 10a to Form 10-K for 1983 for Ameritech Corporation, File No. 1-8612).
      *10b   --Agreement Concerning Contingent Liabilities, Tax Matters  and Termination of Certain Agreements  among
               American  Telephone and Telegraph Company, Bell System Operating Companies, Regional Holding Companies
               and Affiliates dated November 1,  1983 (Exhibit 10j to Form  10-K for 1983 for Ameritech  Corporation,
               File No. 1-8612).
      *10c   --Agreement  Concerning Illinois Bell Mortgage Bonds with American Telephone and Telegraph Company dated
               January 1, 1984 (Exhibit (10)(ii)(B)8 to Form 10-K for 1983, File No. 1-2222).
      *10d   --Ordinance authorizing the Company to construct, maintain and operate a telephone system in the City of
               Chicago, effective July 30, 1931 (Exhibit 5-C to Registration Statement No. 2-42370).
       12    --Computation of Ratio of Earnings to Fixed Charges.
       24    --Consent of Independent Public Accountants.
<FN>
- ---------
*Incorporated by reference
</TABLE>
 
                                       38


<PAGE>
                                                                      EXHIBIT 12
 
                        ILLINOIS BELL TELEPHONE COMPANY
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                    FOR THE YEAR ENDED DECEMBER 31,
                                                                         -----------------------------------------------------
                                                                           1993       1992       1991       1990       1989
                                                                         ---------  ---------  ---------  ---------  ---------
<S>                                                                      <C>        <C>        <C>        <C>        <C>
1. EARNINGS
  a) Income before interest expense, income tax and cumulative effect
     of change in accounting principles................................  $   758.0  $   729.0  $   650.4  $   662.7  $   647.1
  b) Portion of rental expense representative of the interest factor
     (1)...............................................................       10.8       12.3       10.8       11.6       12.9
                                                                         ---------  ---------  ---------  ---------  ---------
        Total 1(a) through 1(b)........................................  $   768.8  $   741.3  $   661.2  $   674.3  $   660.0
                                                                         ---------  ---------  ---------  ---------  ---------
                                                                         ---------  ---------  ---------  ---------  ---------
2. FIXED CHARGES
  a) Total interest expense including capital lease obligations........  $   119.9  $   114.2  $   131.5  $   116.2  $   118.9
  b) Portion of rental expense representative of the interest factor
     (1)...............................................................       10.8       12.3       10.8       11.6       12.9
                                                                         ---------  ---------  ---------  ---------  ---------
        Total 2(a) through 2(b)........................................  $   130.7  $   126.5  $   142.3  $   127.8  $   131.8
                                                                         ---------  ---------  ---------  ---------  ---------
                                                                         ---------  ---------  ---------  ---------  ---------
3. RATIO OF EARNINGS TO FIXED CHARGES..................................       5.88       5.86       4.65       5.28       5.01
                                                                         =========  =========  =========  =========  =========
<FN>
- ---------
(1)   The  Company  considers  one-third  of rental  expense  to  be  the amount
      representing return on capital.
</TABLE>
 
                                       39



<PAGE>
                                                                      EXHIBIT 24
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
    As independent public accountants, we hereby consent to the incorporation by
reference  of our report dated January 28,  1994, included as an Exhibit to this
Form 10-K, into Illinois Bell Telephone Company's previously filed  Registration
Statement File No. 33-50007.
 
                                          ARTHUR ANDERSEN & CO.
 
Chicago, Illinois
March 30, 1994
 
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