Tele Centro Oeste Celular Participações S.A

Publicly-Held Company

CNPJ/MF nº 02.558.132/0001-69 - NIRE 53.30000580-0

SUPPLEMENTARY

RELEVANT FACT

The managements of Tele Centro Oeste Celular Participações S.A. ("TCOPart") and of the following closely-held companies, collectively referred to as "TCO Operators": Telegoiás Celular S.A. ("Telegoiás"), Telems Celular S.A. ("Telems"); Telemat Celular S.A. ("Telemat"); Teleacre Celular S.A. ("Teleacre") and Teleron Celular S.A. ("Teleron"), respectively, with the purpose of supplementing and clarifying certain information disclosed in the Relevant Fact dated June 15, 2004, make it known to the public the following:

1. Right to Withdraw - 2 ^nd and 3 ^rd Stages : As it was declared in the Relevant Fact dated 06/15/04, the transaction to be carried out in the 2 ^nd stage of the transaction, which relates to the TCOPart's partial spin-off, with merger of the spinned-off assets into the TCO Operators, does not give the dissenting shareholders the right to withdraw . As far it refers to the 3 ^rd stage of the transaction, which relates to the merger of the TCO Operators' shares into TCOPart, all the shareholders of the TCO Operators and the holders of common shares in TCOPart which shall have dissented from the resolutions referring to the 3 ^rd Stage shall have the right to withdraw, upon repayment of the shares provenly held by them on 05.14.2004 (date ex-05/14/04), the date of the Relevant Fact that made public the terms and conditions applicable to the referred merger.

2. Ratio of Exchange - 3 ^rd Stage . As far as it refers to item 3.3 of the Relevant Fact dated 06/15/2004, as a supplementary information to the already disclosed data, and with the sole purpose of better explaining to the shareholders and to the market the ratio of exchange of the TCO Operators' shares for TCOPart's shares, calculated based on the economic value of these companies, we disclose below the same ratios of exchange, considering each share , once the referred ratio was previously disclosed in consideration of lots of one thousand shares:

We hereby confirm that, as previously disclosed, any shareholders of the TCO Operators which, by virtue of the substitution, shall be entitled to fractional shares, will receive a whole share in TCOPart.

3. To the same effect, we following disclose the ratios of exchange calculated with basis on the shareholders' equity at market prices criterion for the purposes of Article 264 of the Corporations Act, as set forth in item 3.3.1 of the Relevant Fact dated 06.15.04, considering each share severally: According to the referred criterion, the ratios of exchange of the TCO Operators' shares for TCOPart's shares would be the following: (i) each common share and each preferred share of Telegoiás would be exchanged for 19,396 shares of the respective type in TCOPart; (ii) each common share and each preferred share in Telems would be exchanged for 47,114 shares of the same type in TCOPart; (iii) each common share and each preferred share of Telemat would be exchanged for 108,133 shares of the respective type in TCOPart; (iv) each common share and each preferred share of Teleacre would be exchanged for 4,834 shares of the respective type in TCOPart; and (v) each common share and each preferred share of Teleron would be exchanged for 24,201 shares of the respective type in TCOPart.

4. Shares Issued by the Acquiring Company at the End of the 3^rd Stage : Base don the criterion for ascertaining the ratio of exchange referred to in item 3.3 of the Relevant Fact dated 06/15/04, and with due regard to item 2 above, we hereby rectify the information contained in item 3.4 of the Relevant Fact dated 06/15/04, in order to be recorded that TCOPart shall issue and assign to the shareholders of the TCO Operators, 778,266,728 new common shares and 4,439,609,712 new preferred shares of one sole class, of registered and book-entry type, with no face value, of the same kind and with the same right as those of TCOPart's currently outstanding shares, whereby TCOPart, at the end of the transaction, will have its capital stock represented by 129,458,666,783 common shares and 257,206,308,185 preferred shares, with those rights as provided for in its Articles of Incorporation currently in force.

Brasília, June 17, 2004.

Tele Centro Oeste Celular Participações S.A.
Luis André Carpintero Blanco
Investor Relations Officer

Site: www.vivo.com.br /RI