MILLICOM REACHES ONE MILLION SUBSCRIBER MARK IN VIETNAM

MILLICOM REACHES ONE MILLION SUBSCRIBER MARK IN VIETNAM New York, London and Luxembourg - December 10, 2003 - Millicom International Cellular S.A. ("Millicom") (Nasdaq: MICC) today announces that Mobifone, its subsidiary in Vietnam, is the first Millicom operation to have reached the 1 million-subscriber mark. Marc Beuls, President and CEO of Millicom said: "We are delighted to have reached this important milestone in subscriber numbers in Vietnam. There are strong growth prospects in this and our other markets because of current low penetration levels combined with our pre-paid, mass-market product offering." This press release may contain certain "forward-looking statements" with respect to Millicom's expectations and plans, strategy, management's objectives, future performance, costs, revenues, earnings and other trend information. It is important to note that Millicom's actual results in the future could differ materially from those anticipated in forward-looking statements depending on various important factors. Please refer to the documents that Millicom has filed with the U.S. Securities and Exchange Commission under the U.S. Securities Exchange Act of 1934, as amended, including Millicom's most recent annual report on Form 20-F, for a discussion of certain of these factors. All forward-looking statements in this press release are based on information available to Millicom on the date hereof. All written or oral forward-looking statements attributable to Millicom International Cellular S.A., any Millicom International Cellular S.A members or persons acting on Millicom's behalf are expressly qualified in their entirety by the factors referred to above. Millicom does not intend to update these forward-looking statements. CONTACTS: Marc Beuls President and Chief Executive Officer Millicom International Cellular S.A., Luxembourg Telephone: +352 27 759 101 Andrew Best Investor Relations Shared Value Ltd, London Telephone: +44 20 7321 5022 Millicom International Cellular S.A. is a global telecommunications investor with cellular operations in Asia, Latin America and Africa. It currently has a total of 16 cellular operations and licenses in 15 countries. The Group's cellular operations have a combined population under license of approximately 382 million people. In addition, MIC provides high-speed wireless data services in five countries. Visit our web site at: www.millicom.com ------------------------------------------------------------ This information was brought to you by Waymaker http://www.waymaker.net The following files are available for download: http://www.waymaker.net/bitonline/2003/12/10/20031210BIT20360/wkr0005.pdf

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Millicom International Cellular S.A. is a global telecommunications group with mobile telephony operations in 14 countries in Latin America, Africa and Asia. It also operates cable and broadband businesses in five countries in Central America. The Group’s mobile operations have a combined population under license of approximately 267 million people.

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