Exhibit 12.1  CERTIFICATION  I, Mikael Grahne, certify
that:  1.I have reviewed
this annual report on Form 20-F of Millicom International Cellular S.A.;  2.Based on my
knowledge, this report does not contain any untrue statement of a material fact
or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;  3.Based on my knowledge, the
financial statements, and other financial information included in this report, fairly
present in all material respects the financial condition, results of operations
and cash flows of the company as of, and for, the periods presented in this
report;  4.The companys
other certifying officer(s) and I are responsible for establishing and
maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)
and 15d-15(e)) and internal control over financial reporting (as defined in
Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:  (a)           Designed such
disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material
information relating to the company, including its consolidated subsidiaries, is
made known to us by others within those entities, particularly during the
period in which this report is being prepared;  (b)           Designed such internal
control over financial reporting, or caused such internal control over financial
reporting to be designed under our supervision, to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally
accepted accounting principles;  (c)           Evaluated the
effectiveness of the companys disclosure controls and procedures and presented
in this report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by this report based
on such evaluation; and  (d)           Disclosed in this
report any change in the companys internal control over financial reporting
that occurred during the period covered by the annual report that has
materially affected, or is reasonably likely to materially affect, the companys
internal control over financial reporting; and  5.     The companys other certifying officer(s) and
I have disclosed, based on our most recent evaluation of internal control over
financial reporting, to the companys auditors and the audit committee of the
companys board of directors (or persons performing the equivalent functions):  (a)          All significant
deficiencies and material weaknesses in the design or operation of internal
control over financial reporting which are reasonably likely to adversely
affect the companys ability to record, process, summarize and report financial
information; and  (b)         Any fraud, whether or
not material, that involves management or other employees who have a
significant role in the companys internal control over financial reporting.  Date: March 31st, 2009By:
  /s/Mikael GrahneName: Mikael GrahneTitle: Chief Executive Officer