<PAGE>

                                                             EXHIBIT 4(b)(ii).52

                                                        [LOGO]EuroTel
                                                        ------------------------
                                                        EuroTel Bratislava, a.s.
                                                        Cislo zmluvy:

--------------------------------------------------------------------------------
                        AGREEMENT ON INTERNATIONAL LEASE
                                  OF PERSONNEL

                     hereinafter referred to as "Agreement"
--------------------------------------------------------------------------------

                                    BETWEEN

     Lessor: T - Mobile International AG, a corporation organized under the laws
          of the Federal Republic of Germany, having its registered office in
          Bonn Kennedy Allee 1-5, 531 75, Bonn, identification no. of the entity
          HRB 008716 ( hereinafter referred to as "T -Mobile")

                                      AND

     Lessee: EuroTel Bratislava, a.s.s., a joint stock company organized under
          the laws of the Slovak Republic, having its registered office at
          Stefanikova 17, Bratislava 811 05, Slovak Republic, Identification No.
          35705019 (hereinafter referred to as "EuroTel")

                    UNDER THE FOLLOWING TERMS AND CONDITIONS

     T - Mobile and EuroTel are hereinafter called the "Party" or collectively
                                 the "Parties".

<PAGE>

AGREEMENT ON INTERNATIONAL LEASE OF PERSONNEL                             Page 2
--------------------------------------------------------------------------------
<TABLE>
<S>          <C>                                                        <C>
Section  1   Lease of Personnel ......................................   3

Section  2   Status and Permits ......................................   4

Section  3   Taxation of Leased Persons ..............................   4

Section  4   Responsibility for the Leased Persons ...................   5

Section  5   Lease Fees ..............................................   5

Section  6   Payment of Lease Fees ...................................   6

Section  7   Duration ................................................   7

Section  8   Confidentiality .........................................   7

Section  9   Disputes ................................................   8

Section  10  Miscellaneous ...........................................   8

Appendix / Individual Order ..........................................  10
</TABLE>

<PAGE>

AGREEMENT ON INTERNATIONAL LEASE OF PERSONNEL                             Page 3
--------------------------------------------------------------------------------

Section 1 Lease of Personnel

     (l) In accordance with the provisions of this Agreement, T-Mobile hereby
     undertakes to provide personnel to EuroTel (hereinafter referred to as the
     "Leased Persons" and or "Experts") for the purpose of execution of
     professional and management services for EuroTel. EuroTel hereby undertakes
     to pay a fee to T-Mobile for the procured lease of Experts. T-Mobile has
     no place of business in the Slovak Republic.

     (2) This Agreement shall be considered to be framework contractual document
     stipulating the terms and conditions of the lease of the Experts to EuroTel
     upon and pursuant to which Parties hereto shall agree upon the engagement
     of the individual Leased Person-Expert.

     (3) Lease of the individual person - Expert shall be effectuated upon the
     due conclusion of the both parts of the Individual Order (SERVICE
     CERTIFICATE AND OFFICIAL REQUEST OF PERSONNEL SERVICE SUPPLY - Part 1 of
     the Individual Order, SERVICE CERTIFICATE AND OFFICIAL CONFIRMATION OF THE
     SELECTED PERSON - Part 2 of the Individual Order). Patterns of such
     Individual Order documents form the Appendix and is enclosed hereto.

     (4) Execution of the Individual Order under this Agreement by virtue of
     which lease of the individual person is to be effectuated shall form and be
     deemed as Individual contractual relationship to which also terms and
     conditions hereof shall apply. Foregoing notwithstanding this Individual
     contractual relationship may be terminated prior to the expiration of the
     term of this Agreement or as the case may be of the term to which the lease
     of the Expert has been agreed upon, (i) by agreement of the Parties, (ii)
     upon termination by one of the Parties without specifying any reason with
     three months notice period, or (iii) as of the lapse of the validity and
     effectivity hereof.

Section 2 Status and Permits

     (1) The Leased Persons, regardless of the title nominated to the individual
     by T-Mobile, shall each remain legal employees of T-Mobile, but EuroTel
     shall define the scope of their duties and supervise their work so that
     EuroTel will be their "economic employer". EuroTel has the right to not
     accept any Leased Person presented by T-Mobile should EuroTel consider the
     Leased Person unable to adequately perform the required tasks.

     (2) EuroTel must obtain the residence and work permits necessary for the
     Leased Persons to live and work in the Slovak Republic in accordance with
     Slovak regulation.

Section 3 Taxation of Leased Persons

     (1) Although the Leased Persons shall not be employed by EuroTel, EuroTel
     agrees to deduct from the lease fee for each Leased Person the amount of
     personal income tax payable to the Slovak Tax Authority on behalf of the
     Leased Person resulting from EuroTel being the economic employer of the

<PAGE>

AGREEMENT ON INTERNATIONAL LEASE OF PERSONNEL                             Page 4
--------------------------------------------------------------------------------

     Leased Person. EuroTel must remit this amount to the Tax Authority on
     behalf of each Leased Person as required by Slovak law. EuroTel shall be
     obliged to make an annual settlement of advance payments of the income tax
     on dependent activity for each Leased Person or in case the Leased Person
     must file and does file a personal income tax return personally, EuroTel
     shall be obliged to issue a confirmation of income recorded on the
     payslips. The tax overpayment arising from the year end reconciliation of
     advance payments of the income tax shall be returned by EuroTel to T-Mobile
     or set off against the lease payments due to T-Mobile for Lease Persons
     pursuant to the terms of this Agreement. Tax arrears arising from the year
     end reconciliation of advance payment of the tax shall be withheld by
     EuroTel from the fee invoiced by T-Mobile.

     (2) Immediately after the end of each calendar year (not later than 5
     January of the following year), EuroTel must issue to T-Mobile and to each
     Leased Person a statement of the amount deducted and remitted as
     prepayments to the Tax Authority on behalf of each Leased Person for the
     preceding calendar year. Until 15 April of the following calendar year
     EuroTel should provide the final amount of personal income tax paid per
     Leased Person to T-Mobile.

     (3) Responsibilities of EuroTel with respect to the tax regime and
     treatment of the leased person as stipulated hereinabove shall apply
     provided that such responsibilities shall be in compliance with the valid
     legal regulation of the Slovak Republic.

Section 4 Responsibility for the Leased Persons

     (1) EuroTel shall be entitled to give work instructions to the Leased
     Persons and to control the quality of the work performed. Leased persons
     who will act as members of the Executive Management Board will report to
     the Board of Directors of EuroTel. T-Mobile shall be responsible and shall
     bear the risk for the results of the work performed by the Leased Persons.
     All technical, office and other equipment necessary so that the Leased
     Persons can perform the work assigned to them shall be provided by EuroTel.

     (2) T-Mobile shall be obliged to advise the Leased Persons of their
     obligation to perform the work with due care and in accordance with their
     best knowledge and capabilities. The Leased Persons shall be obliged to
     comply with Slovak law and with EuroTel's internal regulations, and to
     refrain from any acts contrary to EuroTel's interests.

     (3) Each of the Parties shall be responsible to the other Party for any
     damages incurred as a result of negligence, wilful act, wilful omission
     and/or wilful non-compliance with the obligations arising from this
     Agreement. Indemnification for the damage shall be governed by the
     applicable provisions of the Commercial Code of Germany.

<PAGE>

AGREEMENT ON INTERNATIONAL LEASE OF PERSONNEL                             Page 5
--------------------------------------------------------------------------------

Section 5 Lease Fees

     (1) EuroTel must pay T-Mobile a quarterly lease fee for each Leased Person
     calculated as follows:

          (a)  The gross, monthly salary of the Leased Person under his or her
               contract of employment with T-Mobile (hereinafter referred to as
               "Salary"); and

          (b)  the costs incurred by T-Mobile for the relevant month for the
               benefit of the Leased Person, including (but not limited to)
               housing rental, hotel accommodation, the provision of motor
               vehicles for business or private use and other benefits in kind
               (hereinafter referred to as "Benefits"); and

          (c)  normal business trip expenses incurred by the Leased Person borne
               by EuroTel

          (d)  any costs of Benefits incurred by EuroTel

          (e)  5% of the final amount for Salary under (a) plus Benefits, only
               if provided by T-Mobile under (b). For the purposes of
               calculation of the 5%, the amount of Salary under (a) will be
               included net of the Slovak personal income tax which is to be
               administered and paid by EuroTel and net of all other payments
               provided by EuroTel according to above (b) to (d).

     (2) EuroTel must bear the necessary cost of materials used by the Leased
     Persons in the performance of their work for EuroTel.

     (3) Deviant from section(1), sub. section (b), (c) and (d), EuroTel is also
     permitted to bear any cost occuring with the lease employee, e.g. housing,
     rental, hotel accomodation or other business trip expenses itself. In this
     case these expenses are not reaccounted and paid back to T-Mobile.

Section 6 Payment of Lease Fees

     (1) If EuroTel incurs any costs of Benefits and normal business trip
     expenses, it must inform T-Mobile by the [10/th/] day of each month of
     those costs incurred in the previous month (providing the details
     reasonably required by T-Mobile and specifying the currency of
     expenditure).

     (2) T-Mobile must account for EuroTel's reported costs of Benefits and
     normal business trip expenses as an advance payment against the lease fees
     for the month in which EuroTel incurs the costs. These reported costs,
     borne by EuroTel, will be reported in (Euro). T-Mobile must show any credit
     for advance payment by EuroTel in the relevant invoice. For the avoidance
     of doubt, the amount of the costs of Benefits and normal business trip
     expenses paid by EuroTel shall be set off against the lease fees due in the
     quarter following the payment of these costs.

<PAGE>

AGREEMENT ON INTERNATIONAL LEASE OF PERSONNEL                             Page 6
--------------------------------------------------------------------------------

     (3) By the [15/th/] day of the month following the end of each quarter, T-
     Mobile must deliver to EuroTel an invoice in EURO for the lease fees for
     the previous quarter.

     (4) The payment shall be considered effective on the day when EuroTel gives
     instructions to its nominated bank to process the payment order, assuming
     sufficient funds exist in the bank account from which the payment is
     requested.

Section 7 Duration

     (1) This Agreement shall become effective from the date of the execution of
     this Agreement by both Parties hereto and shall have an initial term until
     December 31, 2003. The Agreement shall automatically be extended by one
     year periods unless terminated by either Party in writing with a three
     months notice period. Such a termination notice shall be delivered to other
     Party not later than three months before lapse of the initial term or as
     the case may be of the extended one-year period.

     (2) Foregoing notwithstanding the contractual relation may be terminated
     prior to the expiration of the term by agreement of the Parties or
     termination by one of the Parties without specifying any reason with three
     months notice period.

Section 8 Confidentiality

     Each Party shall treat confidential information which it obtains from the
     other Party pursuant to the terms of this Agreement confidentially. For the
     purpose of this Agreement confidential information means non-public
     information that became known to other Party hereto or which, under the
     circumstances surrounding disclosure known or ought to be known to the
     other Party ought to be treated as confidential.

Section 9 Disputes

     (1) Any amendment to this Agreement or to any Individual Order shall only
     be effective if agreed by the Parties in writing. Individual Order is
     inseparable part of this Agreement.

     (2) If any provision of this Agreement is held legally invalid now or in
     the future, the validity of the remaining provisions shall not be affected
     thereby. The Parties shall replace any invalid provision with that valid
     provision permitted by law which most closely approximates the original
     intent of the Parties.

     (3) This Agreement shall be governed by, interpreted in compliance with and
     subject to German law.

     (4) Should any disputes or discords arise in the course of this Agreement
     or in connection therewith, such disputes or discords shall be settled, if
     possible, through negotiations between the Parties.

     (5) Should such negotiations fail, all disputes between the Parties arising
     from or in connection with this Agreement shall be decided finally and

<PAGE>

AGREEMENT ON INTERNATIONAL LEASE OF PERSONNEL                             Page 7
--------------------------------------------------------------------------------

     conclusively by the Arbitration Court at the "Bundeskammer der Gewerblichen
     Wirtschaft" in Vienna, Austria, by three arbitrators in accordance with the
     rules of said Court. The language of the proceedings shall be English. The
     cost of the arbitration, including reasonable attorney's fees, incurred by
     the other Party shall be borne by the losing Party. If a Party succeeds
     only partially, the costs are to be borne proportionally to the extent that
     such Party has lost.

Section 10 Miscellaneous

     (1) This Agreement is executed in a Slovak and in English version. If there
     is any discrepancy between the versions, the English version shall prevail.

     (2) The contracting Parties represent that the provisions of this Agreement
     are clear and certain, their contractual freedom is not limited and the
     legal act is made in prescribed form. Each Party represents and warrants
     that the person executing this Agreement on its behalf is fully authorised
     to do so.


/s/ Illegible
-------------                                      -----------------------------
Boon, 2001                                            Bratislava, 9.8.2001
T-Mobile International AG


                                                   /s/ Jozef Barta
                                                   -----------------------------
                                                      Jozef Barta
                                                      CEO/procurator
                                                      EuroTel Bratislava, a.s


                                                   /s/ Jan Pitonak
                                                   -----------------------------
                                                      Jan Pitonak
                                                      General Counsel/procurator
                                                      EuroTel Bratislava, a.s.

                                                      -------------------------
                                                      EuroTel Bratislava, a.s.
                                                      Vajnorska 100/A [GRAPHIC]
                                                      831 03 Bratislava
                                                      -------------------------

<PAGE>

AGREEMENT ON INTERNATIONAL LEASE OF PERSONNEL                             Page 8
--------------------------------------------------------------------------------

                                INDIVIDUAL ORDER

             "SERVICE CERTIFICATE AND OFFICIAL REQUEST OF PERSONNEL
           -----------------------------------------------------------
                   SERVICE SUPPLY (Part 1 of INDIVIDUAL ORDER)

1.   Definition of the position:
-------------------------------

     ---------------------------------------------------------------------------
     ---------------------------------------------------------------------------
     ---------------------------------------------------------------------------
     ---------------------------------

2.   Main duties and responsibilities:
     --------------------------------

     ---------------------------------------------------------------------------
     ---------------------------------------------------------------------------
     ---------------------------------------------------------------------------
     ---------------------------

3.   Timing/Required term of the lease engagement:
-------------------------------------------------

     ---------------------------------------------------------------------------
     --------------------------------------------------

4.   Post positioning within the organization:
     ----------------------------------------

     ---------------------------------------------------------------------------
     ---------------------------------------------------------------------------
     --------------------------------------

--------------------------------------------------------------------------------

Signatures


                                                      Jozef Barta
                                                      CEO/procurator
Representatives of T-Mobile International AG          EuroTel Bratislava, a.s.

              Date                                                  Date
-------------      -------                            -------------      -------


                                                      Jan Pitonak
                                                      General Counsel/procurator
                                                      EuroTel Bratislava, a.s.

                                                                    Date
                                                      -------------      -------

<PAGE>

AGREEMENT ON INTERNATIONAL LEASE OF PERSONNEL                             Page 9
--------------------------------------------------------------------------------

           SERVICE CERTIFICATE AND OFFICIAL CONFIRMATION OF SELECTED
                       PERSON (Part2 of INDIVIDUAL ORDER)

.. Name:
        ------------------------------------------------------------------------

.. Identification number of the employee of T-MOBILE:
                                                     ---------------------------

.. Position at EuroTel:
                       ---------------------------------------------------------

.. Date of birth
                ----------------------------------------------------------------

.. Contact address:
                   -------------------------------------------------------------
                   -------------------------------------------------------------

Timing

       . Beginning:
                    ------------------------------------------------------------

       . Duration:
                    ------------------------------------------------------------

T-Mobile fee
             -------------------------------------------------------------------

Special T-Mobile benefits:
                           -----------------------------------------------------

--------------------------------------------------------------------------------

Signatures


Representatives of, a.s.           Representatives of T-Mobile International AG
EuroTel Bratislava, a.s.


--------------------------                   --------------------------
Jozef Barta
CEO/procurator


--------------------------                   --------------------------
Jon Pitonak
General Counsel/procurator


Date:                                        Date:

--------------------------                   --------------------------