<PAGE>



                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


             BYLAWS OF TELE CENTRO OESTE CELULAR PARTICIPACOES S.A.

                                    CHAPTER I

                         CHARACTERISTICS OF THE COMPANY

LEGAL NATURE

ARTICLE 1. TELE CENTRO OESTE CELULAR PARTICIPACOES S/A is a joint stock
corporation governed by Law no. 6404/76, as amended, these Bylaws and other
applicable legal provisions, with indefinite duration term, being the
controlling shareholder of the following companies: TELEGOIAS CELULAR S/A,
TELEMS CELULAR S/A, TELEMAT CELULAR S/A, TELEACRE CELULAR S/A TELERON CELULAR
S/A, NBT-NORTE BRASIL TELECOM S.A. AND TCO-IP S.A.

COMPANY'S PURPOSES:

ARTICLE 2. The Company's purposes are:


I - to exercise control over the Cellular Mobile Service, Personal Mobile
Service, and other carriers providing other kinds of telecommunication services
in general, in conformity with the concessions, authorizations and permits
granted to them;

II - to promote, by itself or through controlled or subsidiary companies, the
expansion and implementation of telecommunication services in their respective
concession, authorization and permit areas;

III - to promote, carry out or guide the raising of foreign or domestic funds to
be invested by the Company or by its controlled companies;

IV - to promote and stimulate study and research activities for the development
of the telecommunications industry;

V - to provide, either directly or through its controlled or subsidiary
companies, technical and consulting services concerning the telecommunication,
Internet, information technology, financial and investor relations areas;

VI - to promote, stimulate, carry out and coordinate, either directly or through
its controlled or subsidiary companies, the formation and training of the staff
necessary for the telecommunications industry;

VII - to import and export goods and services, either directly or through third
parties, for itself, its controlled and subsidiary companies;

VIII - to provide telecommunication services and related activities, including,
however without limitation, cellular mobile service, personal mobile service,
specialized limited service, specialized mobile service, multimedia
communication service, fixed line switched telephone services, and global mobile
service using non-geostationary satellite;


                                       1
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


IX - to market foreign satellite capacity in Brazil and to exploit Brazilian
satellite capacities for transmission of telecommunications signals;

X - to provide value-added services, including, however without limitation,
Internet access services using fixed-line and cellular telephone line networks,
cable TV networks, wireless and private lines, among other networks;

XI - to provide telecommunication capacity, means, and services to companies
holding authorizations, permits or concessions for exploitation of
telecommunication services and to value-added service providers;

XII - to hold interests in the capital stock of other companies, either
commercial or non-commercial, as shareholder, quotaholder, or partner, as well
as in consortia;

XIII - to perform other activities related to its corporate purposes;

XIV - to market (including, however being not limited to, purchase, sell, grant
in free lease, rent, donate) properties and/or goods required or useful for the
exploitation of telecommunication services, as well as of objects related to the
Trademark and/or logotypes used by the Company (including, however being not
limited to, key holders, icons, beach umbrellas, pins);

XV - to develop, register and market computer application programs (Softwares).

HEAD -OFFICE

ARTICLE 3. The Company has its head-office and jurisdiction in the Federal
District of Brazil and, by decision of its Executive Committee, may establish or
close branches, agencies, offices, departments and representation offices
anywhere in Brazil and abroad.

                                   CHAPTER II

                                  CAPITAL STOCK

AUTHORIZED CAPITAL

ARTICLE 4. The company may increase its capital stock up to the limit of two
hundred and thirty-four million, (234,000,000) shares, both common and
preferred, regardless of any amendment to its bylaws, it being incumbent upon
the Board of Directors to make resolutions on the increase and consequent
issuance of new shares, within the referred limit.

PARAGRAPH 1 - No proportion is required to be maintained between the number of
shares of each type. A maximum proportion of two thirds (2/3) of the number of
non-voting or restricted-vote preferred shares in relation to the total number
of issued shares may be maintained.


                                       2
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


PARAGRAPH 2 - The shareholders will have preemptive rights upon the subscription
of capital increases, proportionally to the number of shares held by them.

PARAGRAPH 3 - By resolution of the Board of Directors, (i) preemptive rights may
be excluded in the issuance of shares, convertible debentures and warrants
placed either through sales at Stock Exchanges or public subscription, exchange
for shares in takeover bids, under the terms of articles 257 and 263 of the
Corporate Law, as well as entitlement to tax incentives, under the terms of
special laws, as permitted in article 172 of Law 6404/76; and (ii) upon the
issuance of common shares intended for compliance with the provisions in article
15, ss.2 of Law no. 6404/76, the preemptive right set forth in article 171,
ss.1, (b) of the Joint-Stock Corporations Act, concerning subscription of shares
of different types and classes than those held by shareholders, as permitted in
article 8, ss.2 of Law no. 10330/01, may not be granted to holders of preferred
shares.

SUBSCRIBED CAPITAL

ARTICLE 5 - The Company's subscribed and fully paid-in Capital Stock is nine
hundred and fifty-seven million, eight hundred and forty-three thousand, nine
hundred and thirty-eight reais and fifty-six cents (R$ 957,843,938.56), divided
into eighty-nine million, eight hundred and one thousand, nine hundred and
ninety-nine (89,801,999) registered shares, of which forty-three million, one
hundred and fifty-two thousand, eight hundred and eighty-nine (43,152,889) are
common shares and eighty-five million, seven hundred and thirty-five thousand,
four hundred and thirty-six (85,735,436) are preferred shares, all of them of
book-entry type, with no face value.

SOLE PARAGRAPH. The Company's shares shall be held in a depositary account with
a financial institution, on behalf of the holders thereof, with no issuance of
certificates, the institution being entitled to charge the shareholders for the
transfer cost of their respective shares.

                                   CHAPTER III

                                     SHARES

COMMON SHARES

ARTICLE 6. Each common share entitles the holder thereof to one vote in the
General Shareholders' Meetings.

PREFERRED SHARES
ARTICLE 7. Preferred shares have no voting rights, except in the case provided
for in the sole paragraph of art. 9 hereof, and are ensured priority upon the
repayment of the capital stock, with no premium, and upon the payment of
non-cumulative, minimum dividends, in an amount equal to higher of: (a) of six
percent (6%) per annum on the amount resulting from the division of the
subscribed capital for the total number of shares of the Company; and (b) three
per cent of the net asset value per share.


                                       3
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


SOLE PARAGRAPH - Preferred shares will be granted full voting rights in the
event the Company shall fail to pay the minimum dividend to which they are
entitled for three (3) consecutive fiscal years, which right they shall retain
until such dividends are paid.


                                   CHAPTER IV

                             SHAREHOLDERS' MEETINGS

ARTICLE 8. General Shareholders' Meetings shall be held: (i) regularly, once a
year, within the first four (4) months following the end of every fiscal year,
for resolution of the matters referred to in art. 132 of Law 6404/76 and, (ii)
specially, whenever necessary, either in function of the corporate interests or
in compliance with a provision of these Bylaws, or as required by the applicable
laws.

SOLE PARAGRAPH. The General Shareholders' Meetings shall be called by Board of
Directors, the Chairman of the Board of Directors having the duty of confirming
the referred act.

ARTICLE 9. In addition to the powers granted to it by law, the General
Shareholders' Meeting shall have the private duty of previously approving the
execution of long-term agreements between the Company or its controlled
companies, on the one part, and the controlling shareholder or controlled
companies, affiliates, companies under common control with or controlling the
latter, or which are otherwise related parties of the Company, on the other
part, except where such agreements are subject to uniform clauses.

SOLE PARAGRAPH. Without prejudice to the provisions of Paragraph One of Article
115 of Law No. 6.404/76, the holders of preferred shares shall be entitled to
voting rights in resolutions of the general Meeting referred to in the head
paragraph of this article, as well as in those resolutions related to amendment
or revocation of the following provisions of these Bylaws:

I - head paragraph of Article 9;

II - sole paragraph of Article 10; and

III - Article 30.

ARTICLE 10. The General Shareholders' Meetings shall be presided over by the
Chairman of the Board of Directors, who shall appoint the Secretary from among
the members present to the meeting. In case of absence of the Chairman of the
Board of Directors, the shareholders will choose the chairman and the secretary
of the meeting.

SOLE PARAGRAPH. In the cases provided for in Article 136 of Law No. 6.404/76,
the first call notice for the General Shareholders' Meetings shall be made at
least thirty (30) days in advance and the second call notice shall be made at
least ten (10) days in advance.


                                       4
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


ARTICLE 11. Only shareholders whose shares are registered in their name up to
seventy-two (72) hours before the date set for the respective Meeting will be
entitled to attend and vote at the General Shareholders' Meeting.

PARAGRAPH 1 - The call notice may condition the presence of the shareholder, at
the Meeting, upon the filing, with the Company's head-office, of evidence of his
status of shareholder, issued by the Company itself or by the institution with
which the Company's shares are deposited, at least seventy-two (72) hours in
advance to the date set for the General Shareholders' Meeting.

PARAGRAPH 2 - The call notice may further condition the representation of the
shareholder by proxy, at the Meeting, upon the filing of the respective proxy
with the Company's head-office, at least seventy-two (72) hours in advance to
the date set for the General Shareholders' Meeting.

ARTICLE 12. Minutes shall be drawn-up concerning the businesses and resolutions
made by the General Meeting, which shall be signed by the chairman and the
secretary, as well as by the shareholders present to the meeting, representing
at least the required majority for the resolutions to be made.

PARAGRAPH 1. Save as otherwise decided by the Chairman of the Meeting, the
referred minutes shall be drawn-up as a summary of the facts, including any
dissensions and protests.

PARAGRAPH 2. Save as otherwise decided by the Meeting, the minutes shall be
published with omission of the shareholders' signatures.

                                    CHAPTER V

                               COMPANY MANAGEMENT

ARTICLE 13. The management of the Company shall be incumbent upon the Board of
Directors and the Executive Committee, which will have the duties set forth by
law and in these Bylaws. The members of the Board of Directors and Executive
Committee shall be elected for a three (3)-year term of office, reelection being
permitted, and will be discharged from posting bond for the exercise of their
duties.

PARAGRAPH 1 - All the members of the Board of Directors and of the Executive
Committee shall take office upon signing the corresponding instruments of
investiture, and shall remain in their offices until the investiture of their
successors.

PARAGRAPH 2 - The General Shareholders' Meeting shall establish the overall
compensation of the Company's Directors and Executive Officers, including
benefits of any nature whatsoever and representation allowances, it being the
duty of the Board of Directors to distribute such compensation among its own
members and the members of the Executive Committee.


                                       5
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


PARAGRAPH 3 - The General Shareholders' Meeting may grant profit sharing to the
Company's directors and executive officers, with due regard to the provisions in
art. 152, ss.1 and ss.2 of Law 6404/76, pursuant to the management's proposal.

THE BOARD OF DIRECTORS

COMPOSITION

ARTICLE 14. The Board of Directors shall comprise at least three (3) and at most
twelve (12) members, all of them shareholders of the Company, who may be elected
to and removed from the board by a General Shareholders' Meeting, including in
such number the members of the Board elected by the minority shareholders, if
any, with due regard, concerning the number of members established in this
article, to the provisions in ss.7 of article 141 of the Corporations Act.

SOLE PARAGRAPH - The Board of Directors shall appoint, from among its members,
the Chairman and the Vice-Chairman of the Board.

SUBSTITUTION

ARTICLE 15. In the event of impediment or absence of the Chairman of the Board
of Directors, he/she shall be replaced by the Vice-Chairman. In the absence of
the Vice-Chairman, the Chairman shall be replaced by another member of the Board
appointed by said Board.

PARAGRAPH 1 - In the event of impediment or absence of any other member of the
Board of Directors, the member thus impeded or absent may appoint his/her
substitute, in writing, from among the other members of the Board of Directors,
to represent him/her and make resolutions at the meeting to which he/she is not
able to attend, under the terms of paragraph 3 of article 19 hereof.

PARAGRAPH 2 - Members of the Board of Directors may take part in any meeting of
said Board through conference call, video conference or any other means allowing
all of the Directors to see and hear each other and, in such case, they shall be
deemed to have attended the meeting and shall confirm their vote by a written
statement sent to the Chairman of the Board by mail or fax, promptly after the
meeting. The resolutions taken in said meetings shall be confirmed at the next
first meeting of the Board of Directors, which is physically attended by its
members

ARTICLE 16. In the event of a vacant position in the board of directors, a
substitute will be appointed by the remaining members of the board to complete
the unexpired term of office or until a general meeting is held for election of
the substitute. In the event of vacancy in the majority of the positions in the
Board of Directors, as set forth in Article 14 above, a General Shareholders'
Meeting shall be called for the election of substitutes.


                                       6
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


INCUMBENCY

ARTICLE 17 - It shall be incumbent upon the Board of Directors, in addition to
the duties provided for in Article 142 of the Brazilian Corporations Act, to:

I - approve and amend the internal bylaws of the Board of Directors;

II - decide as to the issuance of shares by the Company, involving capital
increase within the limit of the authorized capital, defining the terms and
conditions of such issuance;

III - decide as to the issuance of warrants and to the issuance of simple,
non-convertible, unsecured debentures;

IV - decide, by delegation of powers of the General Shareholders' Meeting, as to
the following aspects upon the issuance of debentures by the Company: (i) timing
of the issuance, (ii) time and maturity, amortization or redemption terms,
(iii) time terms for payment of interest, profit sharing and premium
reimbursement, if any, (iv) form of subscription or placement, and (v) type of
debentures;

V - decide as to the issuance of promissory notes for public distribution
("Commercial Papers") and as to the submission of the Company's shares to a
depositary system for trading of the respective certificates ("Depositary
Receipts");

VI - authorize the acquisition of shares issued by the Company, for cancellation
or holding as treasury stock for further sale;

VII - authorize the disposal of fixed assets, creation of in rem guarantees and
granting of guarantees to third parties' obligations, in an amount greater than
three hundred million Reais (R$ 300,000,000.00);

VIII - approve the assumption of any obligation not provided for in the
Company's budget for an amount greater than three hundred million Reais (R$
300,000,000.00)

IX - authorize the execution of agreements not provided for in the Company's
budget, for an amount greater than three hundred million Reais (R$
300,000,000.00);

X - approve investments and acquisition of assets not provided for in the
Company's budget, for an amount greater than three hundred million Reais (R$
300,000,000.00);

XI - authorize the acquisition of permanent equity interests in other companies
in an amount greater than three hundred million Reais (R$ 300,000,000.00), not
provided for in the Company's budget, and the encumbrance or disposal of equity
interests;

XII - approve the distribution of interim dividends;

XIII - select or dismiss the independent auditors, with due regard to the
provisions of paragraph 2 of article 142 of the Corporations Law; and

XIV - appoint or dismiss the members of the audit committee, the General
Secretary and the General Counsel.


                                       7
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


ARTICLE 18 - The specific duties of the Chairman of the Board of Directors shall
be: (a) to call the General Shareholders' Meeting when deemed necessary or as
provided by law; (b) to preside over the General Shareholders' Meeting and
appoint the Secretary, from among the members present to the meeting; (c) to
call and preside over the meetings of the Board of Directors when deemed
necessary or as requested by any Director; (d) to ensure that the resolutions
made at the general shareholders' meetings and at the Board of Directors'
meetings are duly implemented.

MEETINGS

ARTICLE 19. The Board of Directors shall meet (i) on a regularly basis, once
every three months and, (ii) on a special basis, whenever called by the
Chairman, who shall indicate the matters to be discussed, with their resolutions
being recorded in the respective minutes.

PARAGRAPH 1. The meetings of the Board shall be called, in writing, at least
seventy-two (72) hours in advance, the call notice to contain the agenda and the
matters to be decided in the relevant meeting.

PARAGRAPH 2. Resolutions by the Board of Directors will be made by majority of
votes, provided that a majority of its acting members is present.

PARAGRAPH 3. Any member of the Board of Directors may be represented by another
Director at the meetings which he/she is unable to attend, provided that powers
are granted for such purpose in a written proxy.


THE EXECUTIVE COMMITTEE

COMPOSITION

ARTICLE 20. The Executive Committee shall comprise eight (8) members, whether
shareholders or not, and who are residents in Brazil, elected by the Board of
Directors, to fill the following positions:

a) Chief Executive Officer;
b) Executive Vice President of Operations;
c) Executive Vice President of Finance, Planning and Control;
d) Executive Vice President of Marketing and Innovation;
e) Vice President of Technology and Networks;
f) Vice President of Compliance and Institutional Relations;
g) Vice President of IT and Products and Services Engineering; and
h) Vice President of Customers.


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                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


SOLE PARAGRAPH - One same Executive Officer may be elected to perform the duties
of more than one office in the Executive Committee, the members of the Executive
Committee not to comprise the Board of Directors.

ARTICLE 21. In the event of absences or temporary impediments, the Chief
Executive Officer shall be replaced by the Executive Vice-President for Finance,
Planning and Control. In the event of any vacancy in an Executive Committee
office, the relevant substitution shall be decided by the Board of Directors; in
case of impediment, the Chief Executive Officer shall appoint the substitute of
the impeded Executive Officer from among the other Executive Officers.

INCUMBENCY OF THE EXECUTIVE COMMITTEE AS A COLLEGIATE BODY AND REPRESENTATION OF
THE COMPANY

ARTICLE 22. The Executive Committee is the competent body for active and passive
representation of the Company, it being incumbent upon its members to perform
all the acts that are necessary and convenient for the management of the
company's business. It is incumbent upon the Executive Committee, as a
collegiate body, without limitation, to perform the following acts:

I. to propose to the Board of Directors the Company's general plans and
programs, specifying the investment plans for expansion and modernization of the
plant;

II. to authorize, within the limits set forth in these Bylaws, the disposal or
encumbrance of fixed assets, creation of in rem guarantees and granting of
guarantees to third parties' obligations;

III. to prepare the balance sheet and income statement for the fiscal year and
the proposal for distribution of dividends, including interim dividends, as well
as the use of the surplus, to be submitted to the Audit Committee, the
Independent Auditors and the Board of Directors for their examination;

IV. whenever applicable, to perform the following acts, within the limits set
forth in these Bylaws: (a) to ratify the purchase of materials and equipment and
the contracting of assets, construction and services; (b) to ratify the sale of
current assets; and (c) to authorize the borrowing of financing and loans by the
Company;

V. to approve the execution of other agreements not mentioned above, within the
limits of its duties.

PARAGRAPH 1 - The resolutions of the Executive Committee shall be taken by
majority vote, provided the majority of its members is present.

PARAGRAPH 2 - With due regard to the provisions of these Bylaws, the Company
shall be bound by (i) the joint signature of two (2) Executive Officers, except
in emergency situations, when the individual signature of the Chief Executive
Officer or, in his absence or temporary impediment, of the Executive
Vice-President for Finance, Planning and Control, shall be permitted, in any
case subject to approval by the Executive Committee; (ii) the signature of one
(1) Executive Officer jointly with one (1) Attorney-in-Fact; or (iii) the
signatures of two (2) Attorneys-in-Fact jointly, provided they are vested with
specific powers.


                                       9
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


PARAGRAPH 3 - Powers of attorney granted in the name of the Company shall always
be executed by two (2) Executive Officers, must specify the powers granted and,
except for those granted for legal purposes, must have a maximum effective term
of one (1) year.

EXECUTIVE OFFICERS' INCUMBENCY

ARTICLE 23. The following are the specific incumbencies of each member of the
Executive Committee:

I - CHIEF EXECUTIVE OFFICER:
a) to follow up on and supervise the implementation of the resolutions of the
General Shareholders' Meetings and the Board of Directors;

b) to follow up on and supervise the implementation of the Company's strategic
policy;

c) to coordinate and supervise the duties of the other Statutory Officers,
representing the Executive Committee at the General Shareholders' Meeting and
before the Board of Directors;

d) to coordinate the legal matters and ordinary relations with government
authorities, through the General Secretary and the General Counsel;

e) to coordinate and follow up on human resources issues, through the Human
Resources Department;

f) to coordinate and follow up on corporate communication issues, through the
Institutional Communication Department;

g) to coordinate and follow up on internal audit issues, through the Audit
Department;

h) to coordinate and follow up funds issues, through the General Funds
Department.

II - EXECUTIVE VICE-PRESIDENT FOR OPERATIONS:

a) to identify the needs of customers segments;

b) to carry out the sale of products and services;

c) to manage and develop sale channels (ex.: own stores, resale, reload and
retail networks);

d) to develop and deploy merchandising actions and cooperative advertising;

e) to manage relationships with customers;

f) to identify the needs of the customers segments;


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                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


g) to negotiate specific proposals and solutions for Companies;

h) to identify opportunities and classify solutions to be developed together
with the Products and Services Engineering for corporate customers;

i) to coordinate interfaces in the development and implementation of the
solutions proposed for Companies;

j) to define sale targets by segment, product, channel, region, seller;

k) to monitor the sales performance by segment, product, channel, region,
seller;

l) to support the marketing department in the definition of portfolio of phone
sets;

m) to prepare and manage commercial agreements; and

n) to train and support the sales team.

III - EXECUTIVE VICE-PRESIDENT FOR FINANCE, PLANNING AND CONTROL:

a) to identify political, economic, social and technological scenarios and
monitor the share market;

b) to define macro-guidelines for the strategic plan and indicators to be
controlled;

c) to support the Executive Committees in the preparation of the strategic plan,
consolidate it and submit it to the Executive Committee;

d) to carry out market and/or economic feasibility studies requested by other
departments;

e) to identify and evaluate business opportunities, evaluate purchase and
partnership opportunities;

f) to implement approved projects (project management);

g) to develop a relationship strategy and interact with market entities and
shareholders performing Investor Relations duties, to give information to the
investing public, to the CVM (Securities Commission) and the entities with which
the company has its securities listed and keep the company's registration
updated;

h) to define and manage the company's financial structure;

i) to structure investments, make investments and raise funds;

j) to manage credit and financial risk (hedging);

k) to coordinate the daily management of cash flow (accounts payable and
receivable);

l) to define accounting policies and criteria and prepare management accounting
reports and reports to the market;


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                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


m) to define and manage the chart of accounts and maintain the database;

n) to analyze, conciliate and close the accounts;

o) to define and follow up on financial-economic indicators;

p) to prepare financial analysis for decision taking;

q) to monitor revenue assurance;

r) to prepare, conciliate and follow up on the budget.

IV - VICE-PRESIDENT FOR TECHNOLOGY AND NETWORKS:

a) to coordinate the strategy for network technological evolution, development
and growth;

b) to plan, size and develop the cellular radio network, switching,
interconnection and service platforms;

c) to program and coordinate the projects;

d) to deploy the service platform-related projects;

e) to guarantee the implementation in accordance with the project
specifications;

f) to monitor network management centers, platforms and information systems;

g) to monitor the global performance of the network;

h) to manage CGRs and service platforms;

i) to manage the traffic;

j) to monitor signalling and roaming systems;

k) physical and logical security of the network;

l) to deploy network projects;

m) to manage the network performance and service platforms;

n) to provide for preventive and corrective maintenance of the network elements
and platform;

o) to manage the quality of the service suppliers; and

p) to carry out projects for the optimization of the network.


                                       12
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


V - EXECUTIVE VICE-PRESIDENT FOR MARKETING AND INNOVATION:

a) to define a marketing strategy and plan for all market segments;

b) to give support to the company in collecting information on customers,
bidding, products and offers;

c) to harmonize offers among the transactions;

d) to manage the life cycle of products and services;

e) to identify opportunities/needs for innovation and classify the development
of new products and services;

f) to classify new sale networks (in coordination with sales);

g) to manage the segments, develop and implement a strategy to promote customer
acquisition, loyalty and retention;

h) to develop and implement offers, goods and services based on the needs of
each segment so as to comply with the demands of its internal customers;

i) to harmonize the form of the local Marketing activity;

j) to plan the needs, kinds and types of terminals and accessories (together
with the Sales);

k) to develop and implement national and regional promotions;

l) to develop and implement advertising strategy and trademark management;

m) to develop and implement national and regional advertising campaigns;

n) to coordinate the participation and organization of the Company's marketing
events.

VI - VICE-PRESIDENT FOR COMPLIANCE AND INSTITUTIONAL RELATIONS:

a) to monitor the regulation environment;

b) to implement relationship and negotiation with the regulating agencies;

c) to prepare the documentation concerning regulating issues;

d) to render official and publish indicators with the Anatel;

e) to internally disclose substantial regulating issues;

f) to have relationships with outside entities;

g) to make contributions to public consultations;

h) to review advertising material;


                                       13
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


i) to negotiate agreements and interconnection and interlink tariffs;

j) to manage interconnection agreements;

k) to plan the network optimization, analysis and proposals of cost
optimization;

l) to make interface with the Network to make the optimization of the network
and performance of improvements feasible; and

m) to define guidelines for the control of interconnection traffic performed by
Billings.

VII - VICE-PRESIDENT FOR INFORMATION TECHNOLOGY AND PRODUCTS AND SERVICES
ENGINEERING:

a) to develop/foment the data business;

b) to develop technical design and test voice and/or data goods and services to
be launched in the market;

c) to coordinate the implementation of voice and/or data goods and services with
the technical and commercial areas;

d) to specify and make interface with platforms of goods and services in IS;

e) to identify and control technical options and suppliers available for
terminals and accessories;

f) to coordinate implementation activities and test of new terminals and
accessories;

g) to establish the strategy for information system and the respective systems
plan;

h) to give support to the respective procedure damages in the preparation and
implementation of projects of business and corporate systems development;

i) to manage the operationalization of systems and infra-structure and
coordinate the integration of systems and platforms;

j) to manage production environments;

k) to give corrective and preventive maintenance of the systems, applications,
platforms and equipment;

l) to coordinate the supervision of service providers;

m) to supply help desk service;

n) to guarantee the implementation, maintenance and improvement of procedures;
and

o) to manage total quality programs.


                                       14
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


VIII - VICE-PRESIDENT FOR CUSTOMERS:

a) to perform customer acknowledgment management;

b) to develop pricing and customer profitability analyses and guidelines;

c) to define criterion and tools for the development of CRM and billing systems;

d) to undertake and develop functional ownership of database and data care;

e) to be in charge of individual or corporate call center and data and wireless
services;

f) to operationalize the call center for retention, loyalty, acquisition and
recovery of customers;

g) to be in charge of back office and resale call center;

h) to control the call center traffic and collect information for the database;

i) to plan alternative channels (hot line, URA, fax, SMS, self-service,
Internet);

j) to manage the billings and fraud control;

k) to define managing ruler of the collection procedure and coordination of
credit limit.

                                   CHAPTER VI

                                 AUDIT COMMITTEE

ARTICLE 24. The Audit Committee, of permanent nature, shall comprise at least
three (3) and at most five (5) full members and equal number of deputy members.

PARAGRAPH 1. The compensation of the members of the Audit Committee, in addition
to reimbursement of transportation and lodging expenses required for the
performance of their duties, shall be defined by the General Shareholders'
Meeting having elected them, and may not be less, for each acting member, than
ten per cent of the average compensation payable to each Executive Officer,
without computing benefits of any nature whatsoever, business entertainment
allowance and profit sharing.

PARAGRAPH 2. In the event of a vacancy in the Audit Committee, the position
shall be filled by the corresponding deputy member. Should there be vacancy in
most positions, the general shareholders' meeting shall be called for purpose of
election of the substitutes.

PARAGRAPH 3. The Audit Committee shall meet (i) on a regular basis, once every
three months, and (ii) on a special basis, upon calling by the Chairman of the
Board of Directors, or by two (2) members of the Audit Committee. Minutes shall
be drawn-up of the resolutions adopted at such meetings.


                                       15
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


PARAGRAPH 4. The meetings of the Audit Committee shall be called in writing, at
least forty-eight (48) hours in advance, the call notice to contain the agenda
of the meeting, and a list of the matters to be discussed in the relevant
meeting.


                                   CHAPTER VII

                      FISCAL YEAR AND FINANCIAL STATEMENTS

FISCAL YEAR

ARTICLE 25. The fiscal year shall coincide with the calendar year. Semiannual or
quarterly balance sheets may be prepared, in addition to the annual balance
sheet.

PROFIT ALLOCATION

ARTICLE 26. The Board of Directors shall present to the General Shareholders'
Meeting, together with the financial statements, proposals for (i) employees'
and officers' profit sharing, and (ii) full allocation of the net profit.

PARAGRAPH 1. The net profit for the year shall be allocated as follows: I - five
percent (5%) shall be allocated to the legal reserve, in order to ensure the
integrity of the capital stock, up to a limit of twenty percent (20%) of the
paid-up capital; II - twenty-five percent (25%) of the net profit adjusted in
conformity with items II and III of Article 202 of Law 6404/76 will necessarily
be distributed as minimum mandatory dividend to all shareholders; and III - the
balance, if any, after compliance with the provisions set forth in the foregoing
items of this article, shall be allocated as determined by the General
Shareholders' Meeting, based on the proposal of the Board of Directors contained
in the financial statements. In case the balance of profit reserves exceeds the
capital stock, the General Shareholders' Meeting shall resolve on the allocation
of the surplus either in the payment or increase of the capital stock or in the
distribution of additional dividends to the shareholders.

PARAGRAPH 2. Dividends unclaimed for three (3) years, counted from the decision
of their distribution, shall forfeit to the Company's benefit.

ARTICLE 27 - The Company may, by resolution of the Board of Directors, declare
dividends (i) to the account of profits ascertained in semiannual balance
sheets; (ii) to the account of profits ascertained in quarterly balance sheets;
provided that the aggregate dividends paid in each semester of the fiscal year
shall not exceed the amount of capital reserves provided for in paragraph one of
article 182 of Law no. 6404/76, or (iii) to the account of retained profits or
profit reserves existing in the latest annual or semiannual balance sheet.

SOLE PARAGRAPH. Interim dividends distributed as provided for herein shall be
deducted from the minimum mandatory dividend.

ARTICLE 28. By resolution of the Board of Directors and with due regard to the
applicable legal provisions, the Company may pay interests on the shareholders'
equity to its shareholders, which interests may be deducted from the minimum
mandatory dividend, "ad referendum" to the General Shareholders' Meeting.


                                       16
                    Bylaws approved at the O/ESM on 03.31.05
<PAGE>

                   TELE CENTRO OESTE CELULAR PARTICIPACOES S/A
                              Publicly-held Company
            CNPJ/MF No. 02.558.132/0001-69 / NIRE No. 53.30000.580-0


                                  CHAPTER VIII

                            MISCELLANEOUS PROVISIONS

ARTICLE 29. The Company shall be liquidated in the cases provided for by law, it
being incumbent upon the General Shareholders' Meeting to decide the form of
liquidation and appoint the liquidator.

ARTICLE 30. The approval, by the Company, through its representatives, of
merger, spin-off, consolidation or dissolution of its controlled companies shall
be preceded by an economic-financial analysis carried out by an independent,
internationally renowned firm, confirming that equitable treatment is awarded to
all the interested companies, the shareholders of which will have full access to
the mentioned analysis report.

ARTICLE 31. To the extent it is not expressly provided for in these Bylaws, the
Company shall be governed by the applicable legal provisions.


                                       17
                    Bylaws approved at the O/ESM on 03.31.05