<PAGE>
                                                                    EXHIBIT 4.11

                                 [FACE OF NOTE]

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO CENTENNIAL
COMMUNICATIONS CORP., CENTENNIAL CELLULAR OPERATING CO. LLC AND CENTENNIAL
PUERTO RICO OPERATIONS CORP. (COLLECTIVELY, THE ISSUERS") OR THEIR AGENT FOR
REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

THIS GLOBAL SECURITY IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.6 OF THE INDENTURE, (II) THIS GLOBAL SECURITY MAY BE
EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.6(a) OF THE INDENTURE,
(III) THIS GLOBAL SECURITY MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION
PURSUANT TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL SECURITY MAY BE
TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF
THE COMPANY.

<PAGE>
                      CENTENNIAL CELLULAR OPERATING CO. LLC
                         CENTENNIAL COMMUNICATIONS CORP.
                     CENTENNIAL PUERTO RICO OPERATIONS CORP.

                           8-1/8% SENIOR NOTE DUE 2014



No. ____                                                         $______________

CUSIP No.

            Centennial Cellular Operating Co. LLC, a Delaware limited liability
company (hereinafter called the "Company," which term includes any successors
under the Indenture defined herein), Centennial Communications Corp., a Delaware
corporation (hereinafter called "Centennial," which term includes any successors
under the Indenture), and Centennial Puerto Rico Operations Corp., a Delaware
corporation (hereinafter called "Centennial PR," which term includes any
successors under the Indenture, and, together with the Company and Centennial,
the "Issuers"), for value received, hereby promise to pay to Cede & Co., or
registered assigns, the principal sum of $_____________ dollars, on February 1,
2014.

            Interest Payment Dates: August 1 and February 1, commencing August
1, 2004

            Record Dates: July 15 and January 15

            Reference is made to the further provisions of this Security on the
reverse side, which will, for all purposes, have the same effect as if set forth
at this place.
<PAGE>
            IN WITNESS WHEREOF, the Company and Centennial have caused this
Instrument to be duly executed under their corporate seal.

Dated: [         ], 2004

                               CENTENNIAL COMMUNICATIONS CORP.



                               By:
                                   ---------------------------------------------
                                   Name:  Tony L. Wolk
                                   Title: Senior Vice President, General Counsel


                               CENTENNIAL CELLULAR OPERATING CO. LLC

                               By: Centennial Communications Corp.,
                                   as sole member

                               By:
                                   ---------------------------------------------
                                   Name:  Tony L. Wolk
                                   Title: Senior Vice President, General Counsel


                               CENTENNIAL PUERTO RICO OPERATIONS CORP.

                               By:
                                   ---------------------------------------------
                                   Name:  Tony L. Wolk
                                   Title: Senior Vice President, General Counsel
<PAGE>
                [FORM OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION]

            This is one of the Securities described in the within-mentioned
Indenture.

Dated: [        ], 2004

                                    U.S. BANK NATIONAL ASSOCIATION
                                    as Trustee

                                    By:
                                        --------------------------------------
                                         Authorized Signatory
<PAGE>
                             [REVERSE SIDE OF NOTE]

                      CENTENNIAL CELLULAR OPERATING CO. LLC
                         CENTENNIAL COMMUNICATIONS CORP.
                     CENTENNIAL PUERTO RICO OPERATIONS CORP.

                           8-1/8% Senior Note due 2014

            Capitalized terms used herein shall have the meaning assigned to
them in the Indenture referred to below unless otherwise indicated.

1.    Interest.

            Centennial Cellular Operating Co. LLC, a Delaware limited liability
company (hereinafter called the "Company," which term includes any successors
under the Indenture defined herein), Centennial Puerto Rico Operations Corp., a
Delaware corporation (hereinafter called "Centennial PR," which term includes
any successors under the Indenture) and Centennial Communications Corp., a
Delaware corporation (hereinafter called "Centennial," which term includes any
successors under the Indenture, and, together with the Company and Centennial
PR, the "Issuers"), promise to pay interest on the principal amount of this
Security at the rate and in the manner specified below. Interest will accrue at
8-1/8% per annum and will be payable semi-annually in arrears in cash on August
1 and February 1 of each year or if any such day is not a Business Day on the
next succeeding Business Day (each an "Interest Payment Date") commencing August
1, 2004, to Holders of the Securities at the close of business on the
immediately preceding July 15 or January 15, whether or not such date is a
Business Day (each, a "Record Date").

            Interest will be computed on the basis of a 360-day year consisting
of twelve 30-day months. Interest shall accrue from the most recent date to
which interest has been paid or, if no interest has been paid, from the date of
issuance. To the extent lawful, the Issuers shall pay interest on overdue
principal at the rate of the then applicable interest rate on the Securities;
they shall pay interest on overdue installments of interest (without regard to
any applicable grace periods) at the same rate to the extent lawful.

2.    Method of Payment.

            The Issuers shall pay interest and Additional Interest, if any, on
the Securities (except defaulted interest) to the Persons who are the registered
Holders at the close of business on the Record Date immediately preceding the
Interest Payment Date. Holders must surrender Securities to a Paying Agent to
collect principal payments. Except as provided below, the Issuers shall pay
principal and interest in such coin or currency of the United States of America
as at the time of payment shall be legal tender for payment of public and
private debts ("U.S. Legal Tender"). However, the Issuers may pay principal and
interest by wire transfer of Federal funds, or interest by its check payable in
such U.S. Legal Tender. The Issuers may deliver any such interest payment to the
Paying Agent or the Issuers may mail any such interest payment to a Holder at
the Holder's registered address.
<PAGE>
3.    Paying Agent and Registrar.

            Initially, U.S. Bank National Association (the "Trustee") will act
as Paying Agent and Registrar. The Issuers may change any Paying Agent,
Registrar or co-Registrar without notice to the Holders. The Issuers or any of
their Subsidiaries may, subject to certain exceptions, act as Paying Agent,
Registrar or co-Registrar.

4.    Indenture.

            The Issuers issued the Securities under an Indenture, dated as of
February 9, 2004 (the "Indenture"), among the Issuers and the Trustee. The terms
of the Securities include those stated in the Indenture and those made part of
the Indenture by reference to the Trust Indenture Act, as in effect on the date
of the Indenture. The Securities are subject to all such terms, and Holders of
Securities are referred to the Indenture and said Act for a statement of them.
The Securities are general obligations of the Issuers initially issued in an
aggregate principal amount to $325,000,000. The Indenture pursuant to which this
Security is issued provides for an unlimited amount of Additional Securities to
be issued thereunder.

5.    Redemption.

            The Securities will be subject to redemption at any time on or after
February 1, 2009, at the option of the Issuers, in whole or in part, on not less
than 30 nor more than 60 days' prior notice, in amounts of $1,000 or an integral
multiple thereof, at the following Redemption Prices (expressed as percentages
of the principal amount), if redeemed during the 12 month period beginning
February 1 of the years indicated below:

<TABLE>
<CAPTION>
                             Year                   Redemption Price
                             ----                   ----------------
<S>         <C>                                     <C>
            2009..................................        104.0625%

            2010..................................        102.7083%

            2011..................................        101.3542%

            2012 and thereafter...................        100%
</TABLE>

in each case, together with accrued and unpaid interest, if any, and Additional
Interest to the Redemption Date (subject to the rights of Holders on relevant
Record Dates to receive interest due on an Interest Payment Date).

            In addition, at any time prior to February 1, 2007, the Issuers, at
their option, may use the net cash proceeds of one or more Public Equity
Offerings or Strategic Equity Offerings in a single transaction or a series of
related transactions to redeem up to an aggregate of 35% of the aggregate
principal amount of Securities originally issued under the Indenture at a
Redemption Price equal to 108.125% of the aggregate principal amount thereof,
plus accrued and unpaid interest thereon, if any, to the Redemption Date
(subject to the rights of Holders on relevant Record Dates to receive interest
due on an Interest Payment Date); provided that at least 65% of the initial
aggregate principal amount of Securities remains outstanding immediately after
the
<PAGE>
occurrence of such redemption; provided further that any such redemption with
respect to a Strategic Equity Offering may not occur in connection with or after
the occurrence of a Change of Control; and provided further that any such net
proceeds received by Centennial are first contributed to the Company as a
capital contribution prior to any such redemption. In order to effect the
foregoing redemption, the Company must mail a notice of redemption no later than
30 days after the closing of the related Public Equity Offering or Strategic
Equity Offering and must consummate such redemption within 60 days of the
closing of the Public Equity Offering or Strategic Equity Offering.

            In addition, the Securities may be redeemed upon a Change of Control
at any time prior to February 1, 2009, at the option of the Issuers, in whole
and not in part, within 60 days of such Change of Control. Prior to February 1,
2006, the Redemption Price will be equal to (i) 108.125% of the principal amount
of the Securities, plus (ii) accrued interest to the Redemption Date (subject to
the rights of Holders on relevant Record Dates to receive interest due on an
Interest Payment Date). On or after February 1, 2006, but prior to February 1,
2009, the Redemption Price will be equal to (i) 100% of the principal amount of
the Securities, plus (ii) accrued interest to the Redemption Date (subject to
the rights of Holders on relevant Record Dates to receive interest due on an
Interest Payment Date) plus (iii) the Applicable Premium, if any.

            In addition, the Securities may be redeemed at any time prior to
February 1, 2006, at the option of the Issuers, in whole or in part, with the
net cash proceeds of a sale of assets that would be considered an Asset Sale
within 60 days of such sale of assets at a Redemption Price equal to (i)
108.125% of the principal amount of the Securities, plus (ii) accrued interest
to the Redemption Date (subject to the rights of Holders on relevant Record
Dates to receive interest due on an Interest Payment Date); provided that any
such redemption shall be for (A) Securities with an aggregate principal amount
of at least $50,000,000; provided that immediately after any such redemption,
Securities with an aggregate principal amount of at least $150,000,000 remain
outstanding or (B) all of the outstanding aggregate principal amount of the
Securities.

            In the case of a partial redemption, the Trustee shall select the
Securities or portions thereof for redemption in compliance with the
requirements of the principal national securities exchange, if any, on which the
Securities are listed, or if the Securities are not so listed, on a pro rata
basis, by lot or by any other manner as it deems appropriate and fair; provided
that any such redemption pursuant to the provisions relating to a Public Equity
Offering or a Strategic Equity Offering shall be made on a pro rata basis or on
as nearly a pro rata basis as practicable (subject to the procedures of DTC or
any other depositary). The Securities may be redeemed in part in multiples of
$1,000 only.

            Any such redemption will comply with Article III of the Indenture.

6.    Notice of Redemption.

            Except as provided in the next paragraph, notice of redemption will
be sent by first class mail, at least 30 days and not more than 60 days prior to
the Redemption Date, to the Holder of each Security to be redeemed at such
Holder's last address as then shown upon the registry books of the Registrar.
<PAGE>
            Any notice which relates to a Security to be redeemed in part only
must state the portion of the principal amount to be redeemed and must state
that on and after the date fixed for redemption, upon surrender of such
Security, a new Security or Securities in a principal amount equal to the
unredeemed portion thereof will be issued. On and after the date fixed for
redemption, interest will cease to accrue on the portions of the Securities
called for redemption.

7.    Denominations; Transfer; Exchange.

            The Securities are in registered form, without coupons, in
denominations of $1,000 and integral multiples of $1,000. A Holder may register
the transfer of, or exchange Securities in accordance with, the Indenture. The
Registrar may require a Holder, among other things, to furnish appropriate
endorsements and transfer documents and to pay any taxes and fees required by
law or permitted by the Indenture. The Registrar need not register the transfer
of or exchange any Securities selected for redemption prior to 15 days after the
notice of redemption.

8.    Persons Deemed Owners.

            The registered Holder of a Security may be treated as the owner of
it for all purposes.

9.    Unclaimed Money.

            If money for the payment of principal or interest remains unclaimed
for two years, the Trustee and the Paying Agent(s) will pay the money back to
the Issuers. After that, all liability of the Trustee and such Paying Agent(s)
with respect to such money shall cease.

10.   Defeasance and Discharge Prior to Redemption or Maturity.

            Except as set forth in the Indenture, if the Issuers irrevocably
deposit with the Trustee, in trust, for the benefit of the Holders, U.S. Legal
Tender and Government Securities or a combination thereof, in such amounts as
will be sufficient in the opinion of a nationally recognized firm of independent
public accountants selected by the Trustee, to pay the principal of, premium, if
any, and interest on the Securities to redemption or maturity and comply with
the other provisions of the Indenture relating thereto, the Issuers will be
discharged from certain provisions of the Indenture and the Securities
(including the financial covenants, but excluding their obligation to pay the
principal of (and premium, if any) and interest on the Securities). Upon
satisfaction of certain additional conditions set forth in the Indenture, the
Company may elect to have the Issuers' obligations discharged with respect to
outstanding Securities.

            In addition, the Indenture will be discharged in full as to all
outstanding Securities when (a) either (i) all Securities are delivered to the
Trustee for authentication or (ii) all Securities not so delivered have become
due and payable, will become due and payable within one year or are to be called
for redemption within one year, and in either event the Issuers have deposited
with the Trustee an amount in United States dollars sufficient to pay and
discharge all of the Securities, (b) the Issuers have paid all other sums
payable under the Indenture by them and (c) the Issuers have delivered an
Officers' Certificate and Opinion of Counsel related thereto.
<PAGE>
11.   Amendment; Supplement; Waiver.

            Subject to certain exceptions, the Indenture or the Securities may
be amended or supplemented with the written consent of the Holders of at least a
majority in aggregate principal amount of the Securities then outstanding, and
any existing Default or Event of Default or compliance with any provision may be
waived with the consent of the Holders of a majority in aggregate principal
amount of the Securities then outstanding. Without notice to or consent of any
Holder, the parties thereto may amend or supplement the Indenture or the
Securities to, among other things, cure any ambiguity, defect or inconsistency,
or make any other change that does not adversely affect the rights of any Holder
of a Security.

12.   Restrictive Covenants.

            The Indenture imposes certain limitations on the ability of the
Company and its Restricted Subsidiaries to, among other things, incur additional
Indebtedness and Disqualified Capital Stock, pay dividends or make certain other
restricted payments, enter into certain transactions with Affiliates, incur
Liens, sell assets, merge or consolidate with any other Person or transfer (by
lease, assignment or otherwise) substantially all of the properties and assets
of the Company. The limitations are subject to a number of important
qualifications and exceptions. The Issuers must periodically report to the
Trustee on compliance with such limitations.

13.   Repurchase at Option of Holder.

            (a) If there is a Change of Control, the Issuers shall be required
to offer to purchase on the Change of Control Purchase Date all outstanding
Securities at a purchase price equal to 101% of the principal amount thereof,
together with any accrued and unpaid interest and Additional Interest, to the
Change of Control Purchase Date. Holders of Securities will receive a Change of
Control Offer from the Issuers prior to any related Change of Control Purchase
Date and may elect to have such Securities purchased by properly tendering such
Securities pursuant to the Change of Control Offer. Notwithstanding the
foregoing, the Issuers will not be required to make a Change of Control Offer
if, upon a Change of Control, a third party (A) makes an offer to purchase
Securities in the manner, at the times and otherwise in compliance with the
requirements set forth in Article XI of the Indenture and (B) purchases all
Securities validly tendered and not withdrawn under such offer to purchase.

            (b) The Indenture imposes certain limitations on the ability of the
Company and its Restricted Subsidiaries to sell assets. In the event the
proceeds from a permitted Asset Sale exceed certain amounts, as specified in the
Indenture, the Company will be required either to reinvest the proceeds of such
Asset Sale as described in the Indenture or to make an offer to purchase each
Holder's Securities at 100% of the principal amount thereof, plus accrued
interest, if any, to the purchase date.

14.   Successors.

            When a successor assumes all the obligations of its predecessor
under the Securities and the Indenture, the predecessor will be released from
those obligations.
<PAGE>
15.   Defaults and Remedies.

            If an Event of Default occurs and is continuing (other than as Event
of Default relating to certain events of bankruptcy, insolvency or
reorganization), then in every such case, unless the principal of all of the
Securities shall have already become due and payable, either the Trustee or the
Holders of 25% in aggregate principal amount of Securities then outstanding may
declare all the Securities to be due and payable immediately in the manner and
with the effect provided in the Indenture. The Holders of Securities may not
enforce the Indenture or the Securities except as provided in the Indenture. The
Trustee may require indemnity satisfactory to it before it enforces the
Indenture or the Securities. Subject to certain limitations, Holders of a
majority in aggregate principal amount of the Securities then outstanding may
direct the Trustee in its exercise of any trust or power. The Trustee may
withhold from Holders of Securities notice of any continuing Default or Event of
Default (except a Default in payment of principal or interest), if it determines
that withholding notice is in their interest.

16.   Trustee Dealings with Issuers.

            The Trustee under the Indenture, in its individual or any other
capacity, may make loans to, accept deposits from, perform investment advisory
or other management services and perform services for the Issuers or their
Affiliates, and may otherwise deal with the Issuers or their Affiliates as if it
were not the Trustee.

17.   No Recourse Against Others.

            No direct or indirect stockholder (or partner, limited liability
company member or employee of a stockholder), employee, officer or director, as
such, past, present or future, of the Issuers or any successor entity or any
Affiliate thereof shall have any personal liability in respect of the
obligations of the Issuers under the Securities or the Indenture by reason of
his or its status as such stockholder (or partner, limited liability company
member or employee of a stockholder), employee, officer or director. Each Holder
of a Security by accepting a Security waives and releases all such liability.
The waiver and release are part of the consideration for the issuance of the
Securities.

18.   Authentication.

            This Security shall not be valid until the Trustee or authenticating
agent signs the certificate of authentication on the other side of this
Security.

19.   Abbreviations and Defined Terms.

            Customary abbreviations may be used in the name of a Holder of a
Security or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).
<PAGE>
20.   CUSIP Numbers.

            Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures, the Issuers will cause CUSIP numbers to be
printed on the Securities as a convenience to the Holders of the Securities. No
representation is made as to the accuracy of such numbers as printed on the
Securities and reliance may be placed only on the other identification numbers
printed hereon.

21.   Additional Rights of Holders.

            In addition to the rights provided to Holders of Securities under
the Indenture, Holders of Securities shall have all the rights set forth in a
Registration Rights Agreement dated as of February 9, 2004, among the Issuers
and Lehman Brothers Inc. and Credit Suisse First Boston LLC, as representative
of several Initial Purchasers named therein. In the case of Additional
Securities, Holders of Securities shall have the rights set forth in one or more
registration rights agreements with the Issuers, if any (collectively, the
"Registration Rights Agreement").
<PAGE>
                               FORM OF ASSIGNMENT

I or we assign this Security to:

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
             (Print or type name, address and zip code of assignee)

________________________________________________________________________________
      Please insert Social Security or other identifying number of assignee

and irrevocably appoint ___________________________________________ agent to
transfer this Security on the books of the Issuers. The agent may substitute
another to act for him.


Dated:  ______________________      Signed:__________________________________
                                            (Sign exactly as name appears on
                                             the other side of this Security)

Signature(s) must be guaranteed by an eligible guarantor institution (banks,
stock brokers, savings and loan associations and credit unions with membership
in an approved signature guarantee medallion program) pursuant to Securities and
Exchange Commission Rule 17Ad-15.
<PAGE>
                       OPTION OF HOLDER TO ELECT PURCHASE

      If you want to elect to have this Security purchased by the Issuers
pursuant to Section 4.14 or Article XI of the Indenture, check the appropriate
box:

        [ ] Section 4.14      [ ] Article XI

      If you want to elect to have only part of this Security purchased by the
Issuers pursuant to Section 4.14 or Article XI of the Indenture, as the case may
be, state the principal amount you want to be purchased: $_____________

Date:  ______________________       Signed:__________________________________
                                            (Sign exactly as name appears on
                                             the other side of this Security)
<PAGE>
                 SCHEDULE OF EXCHANGES OF DEFINITIVE SECURITIES

      The following exchanges of a part of this Global Security for Definitive
Securities have been made:

<TABLE>
<CAPTION>
               Amount of         Amount of         Principal         Signature of
              decrease in       increase in     Amount of this        authorized
               Principal         Principal      Global Security       officer of
            Amount of this    Amount of this    following each         Trustee
Date of          Global            Global        decrease (or       or Securities
Exchange       Security          Security          increase)          Custodian
--------       --------          --------          ---------          ---------
<S>         <C>               <C>               <C>                 <C>
</TABLE>