NOTICE OF FIRST QUARTER 2012 RESULTS AND CONFERENCE CALL

Stockholm, April 11, 2012 – Millicom International Cellular S.A. (“Millicom”)
(Stockholmsbörsen: MIC) will announce its financial results for the first
quarter of 2012 on Wednesday, 18 April 2012 at 8.00 AM (Stockholm) / 7.00 AM
(London). The company will host a conference call for the global financial
community at 2.00 PM (Stockholm) / 1.00 PM (London) / 8.00 AM (New York).
The conference call will be webcast in listen-only mode on Millicom’s website at
www.millicom.com.

Dial-in information:
Please dial-in 10 minutes before the
scheduled start time to register your attendance. Dial-in numbers for the call
are as follows:

Sweden: +46 (0)8 5853 6965
UK: +44 (0)20 7136 6283
US: +1
212 444 0896

The access code is: 6635419#

A replay will be available for 7
days after the conference call.
Contacts
Chief Financial Officer
François-Xavier Roger
Tel: +352 27 759
327

Investor Relations
Justine Dimovic
Tel: +352 27 759 479

Emily
Hunt
Tel: +44 7779 018 539

 (http://www.millicom.com/)
About Millicom
Millicom International Cellular S.A. is a global
telecommunications group with mobile telephony operations in 13 countries in
Latin America and Africa. It also operates various combinations of fixed
telephony, cable and broadband businesses in five countries in Central America.
The Group’s mobile operations have a combined population under license of
approximately 265 million people.

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. employees or representatives
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.