SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                               NII HOLDINGS, INC.
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                                (Name of Issuer)


                         Common Stock, $0.001 par value
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                         (Title of class of securities)


                                    62913F201
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                                 (CUSIP number)


                               Russell A. Thompson
                               MacKay Shields LLC
                                9 West 57 Street
                            New York, New York 10019
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       (Name, address and telephone number of person authorized to receive
                          notices and communications)


                                November 13, 2002
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             (Date of event which requires filing of this statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box
[_].

Note: Schedules filed in paper format shall include a signed original and five
copies of the Schedule, including all exhibits.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purposes of Section 18 of the  Securities  Exchange Act of
1934 (the  "Exchange  Act") or  otherwise  subject  to the  liabilities  of that
section of the Exchange Act but shall be subject to all other  provisions of the
Exchange Act.

                         (Continued on following pages)
                              (Page 1 of 5 pages)



------------------------              ------------------------------------------
CUSIP No.  62913F201         13D
------------------------              ------------------------------------------

1   NAME OF REPORTING PERSON:            MacKay Shields LLC(f/k/a MacKay-Shields
                                         Financial Corporation)
    S.S. OR I.R.S. IDENTIFICATION NO.
    OF ABOVE PERSON:
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2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                   (a) [_]
                                                                        (b) [_]
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3   SEC USE ONLY

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4   SOURCE OF FUNDS:                OO

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5   CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS IS REQUIRED  PURSUANT TO ITEM
    2(d) OR 2(e):                                                           [_]

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6   CITIZENSHIP OR PLACE OF ORGANIZATION:              Delaware

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 NUMBER OF       7     SOLE VOTING POWER:              4,360,978
  SHARES
              ------------------------------------------------------------------
BENEFICIALLY     8     SHARED VOTING POWER:            0
 OWNED BY
              ------------------------------------------------------------------
   EACH          9     SOLE DISPOSITIVE POWER:         4,360,978
 REPORTING
             -------------------------------------------------------------------
PERSON WITH     10     SHARED DISPOSITIVE POWER:       0
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11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY
      REPORTING PERSON:                                4,360,978
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12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
     SHARES:                                                                 [_]
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13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):    21.8%

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14   TYPE OF REPORTING PERSON:      IA

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                                  SCHEDULE 13D

     Item 1.  Security and Issuer.

     This statement relates to the common stock, par value $0.001 per share (the
"Shares") of NII  Holdings,  Inc. (the  "Company"),  whose  principal  executive
offices are located at 10700 Parkridge  Boulevard,  Suite 600, Reston,  Virginia
20191.

     Item 2.  Identity and Background.

     The person filing this statement is MacKay Shields LLC, a limited liability
company  organized  under the laws of Delaware and,  registered as an investment
adviser under the Investment  Advisers Act of 1940 (File No. 801-19525).  MacKay
Shields'  principal  address is 9 West 57th  Street,  New York,  New York 10019.
MacKay Shields acts as investment  manager for a number of clients,  pension and
profit-sharing plans and also to mutual funds.

     MacKay  Shields  has  never  been a party  to a civil  proceeding  before a
judicial or administrative  body of competent  jurisdiction as a result of which
it was or is now subject to a judgment,  decree or final order enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

     Item 3.  Source and Amount of Funds or Other Consideration.

     MacKay Shields  currently holds (on behalf of those client  accounts),  and
has the sole right to vote and direct the disposition  of, equity  securities of
the company totaling  4,360,978 shares.  All funds used to purchase or acquire a
security  interest in the Company  came  directly  from  proceeds of  investment
advisory clients.  No single client account holds a beneficial security interest
in the Company equal to or greater than 5%.

     Item 4.  Purpose of Transaction.

     On November 13, 2002, the Plan of Reorganization,  Rights  Subscription and
Backstop Agreement of the Company became effective. Pursuant to the terms of the
Rights  Subscription,  MacKay  Shields  received  Shares in the Company.  MacKay
Shields holds  securities of the Company  described herein with the intention of
maximizing  shareholder  value. In addition to monitoring the performance of the
Company  and its  management,  MacKay  Shields  may also take  certain  steps to
further its stated objective.  These steps may include,  but are not limited to,
urging Company  management to take appropriate  corporate actions to ensure that
shareholder interests are adequately protected.

     Item 5.  Interest in Securities of the Issuer.

     Based upon  information  provided  by the  Company,  there were  issued and
outstanding  20,000,000  Shares.  MacKay  Shields (as an  investment  adviser to
several  client  accounts)  is the  holder  of and/or  has the right to  receive
4,360,978  Shares.  Thus for the  purposes  of Reg.  Section  240.13d-3,  MacKay


                                  Page 3 of 5


Shields is deemed to beneficially own 4,360,978 Shares, or 21.8% of those deemed
issued and outstanding pursuant to Reg. Section 240.13d-3.

     Item 6.  Contracts, Arrangement, Understanding or Relationships With
Respect to Securities of the Issuer.

     Neal P. Goldman and Donald E. Morgan, both employees of MacKay Shields, are
directors  of the  Company.  Except  as  described  in  this  Schedule  13D,  no
contracts,  arrangements,  understandings  or similar  relationships  exist with
respect to the  securities of the Company  between MacKay Shields and any person
or entity.

     Item 7.  Material to be Filed as Exhibits.

     None.




                                  Page 4 of 5



                                    SIGNATURE

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

     Dated:  November 27, 2002



                                            MACKAY SHIELDS LLC



                                                 /s/   Russell A. Thompson
                                            ------------------------------------
                                            By:     Russell A. Thompson
                                            Title:  Chief Compliance Officer



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