UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

o

Rule 13d-1(b)

o

Rule 13d-1(c)

x

Rule 13d-1(d)

CUSIP No. 591708102

1.

Names of Reporting Persons
Madison Dearborn Capital Partners IV, L.P.

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

o

(b)

x

3.

SEC Use Only

4.

Citizenship or Place of Organization
Delaware

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
--0--

6.

Shared Voting Power
38,568,184  (See Item 4)

7.

Sole Dispositive Power
--0--

8.

Shared Dispositive Power
38,568,184  (See Item 4)

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
38,568,184  (See Item 4)

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
11.1%

12.

Type of Reporting Person (See Instructions)
PN

CUSIP No. 591708102

1.

Names of Reporting Persons
Madison Dearborn Partners IV, L.P.

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

o

(b)

x

3.

SEC Use Only

4.

Citizenship or Place of Organization
Delaware

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
--0--

6.

Shared Voting Power
38,576,812  (See Item 4)

7.

Sole Dispositive Power
--0--

8.

Shared Dispositive Power
38,576,812  (See Item 4)

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
38,576,812  (See Item 4)

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
11.1%

12.

Type of Reporting Person (See Instructions)
PN

CUSIP No. 591708102

Item 1.

(a)

Name of Issuer
MetroPCS Communications, Inc.

(b)

Address of Issuer’s Principal Executive Offices
8144 Walnut Hill Land, Suite 800

Dallas, Texas  75231

Item 2.

(a)

Name of Person Filing

This Schedule 13G is being jointly filed by each of the following persons pursuant to Rule 13-d(1)(k) promulgated by the Securities and Exchange Commission pursuant to Section 13 of the Securities and Exchange Act of 1934, as amended (the “Act”):

(1)               Madison Dearborn Capital Partners IV, L.P.  (“MDCP”)

(2)               Madison Dearborn Partners IV, L.P.  (“MDP IV”)

each of which is referred to as a “Reporting Person,” or collectively, the “Reporting Persons.” The Reporting Persons have entered into a Joint Filing Agreement, a copy of which is filed with this Schedule 13G as Exhibit A, pursuant to which the Reporting Persons have agreed to file this Schedule 13G jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Act.

The Reporting Persons may be deemed to constitute a “group” for purposes of Section 13(d)(3) of the Act. Pursuant to Rule 13d-4 of the Act, the Reporting Persons expressly declare that the filing of this Schedule 13G shall not be construed as an admission that any such person is, for the purposes of Section 13(d) and/or Section 13(g) of the Act or otherwise, the beneficial owner of any securities covered by this Schedule 13G held by any other person. The Reporting Persons expressly disclaim that they have agreed to act as a group other than as described in this Schedule 13G.

(b)

Address of Principal Business Office or, if none, Residence

The address of the principal business office of each of the Reporting Persons is Three First National Plaza, Suite 3800, Chicago, Illinois 60602.

(c)

Citizenship
Each of MDCP and MDP IV is a limited partnership organized under the laws of the State of Delaware.

(d)

Title of Class of Securities
Common Stock, par value $0.0001 per share

(e)

CUSIP Number
591708102

Item 3.

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

o

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b)

o

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)

o

Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d)

o

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e)

o

An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f)

o

An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

(g)

o

A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);

(h)

o

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

o

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

o

Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Not applicable.

CUSIP No. 591708102

Item 4.

Ownership

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

All ownership percentages of the securities reported herein are based upon 347,430,336 shares of Common Stock outstanding as of October 31, 2007, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 14, 2007.

The ownership of each of the Reporting Persons is presented below:

(a)

Amount beneficially owned:   

MDCP is the record owner of 38,568,184 shares of Common Stock of the Issuer.  MDP IV is the record owner of 8,628 shares of Common Stock of the Issuer.  The shares of Common Stock owned by MDCP may be deemed to be beneficially owned by MDP IV, who is the sole general partner of MDCP.  John A. Canning, Jr., Paul J. Finnegan and Samuel M. Mencoff are the sole members of a limited partner committee of MDP IV that has the power, acting by majority vote, to vote or dispose of the shares directly held by MDCP and MDP IV.  Each of Messrs. Canning, Finnegan and Mencoff, and each of the Reporting Persons, other than the Reporting Person referenced as the record owner above, hereby disclaims beneficial ownership of any shares except to the extent of his, or its, pecuniary interest therein.

(b)

Percent of class:   

See Item 11 of each cover page.  See also Item 4(a).

(c)

Number of shares as to which the person has:

(i)

Sole power to vote or to direct the vote   

See Item 5 of each cover page.

(ii)

Shared power to vote or to direct the vote    

See Item 6 of each cover page.

(iii)

Sole power to dispose or to direct the disposition of   

See Item 7 of each cover page.

(iv)

Shared power to dispose or to direct the disposition of   

See Item 8 of each cover page.

Item 5.

Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following   o.

Not applicable.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person

See response to Item 4.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person

Not applicable.

Item 8.

Identification and Classification of Members of the Group

Not applicable.

Item 9.

Notice of Dissolution of Group

Not applicable.

CUSIP No. 591708102

Item 10.

Certification

Not applicable.

MADISON DEARBORN CAPITAL PARTNERS IV, L.P.

By: Madison Dearborn Partners IV, L.P.

Its: General Partner

By: Madison Dearborn Partners, L.L.C.

Its: General Partner

By: 

/s/ Mark B. Tresnowski

Name: Mark B. Tresnowski

Title: Managing Director

MADISON DEARBORN PARTNERS IV, L.P.

By: Madison Dearborn Partners, L.L.C.

Its: General Partner

By: 

/s/ Mark B. Tresnowski

Name: Mark B. Tresnowski

Title: Managing Director

CUSIP No. 591708102

MADISON DEARBORN CAPITAL PARTNERS IV, L.P.

By: Madison Dearborn Partners IV, L.P.

Its: General Partner

By: Madison Dearborn Partners, L.L.C.

Its: General Partner

By: 

/s/ Mark B. Tresnowski

Name: Mark B. Tresnowski

Title: Managing Director

MADISON DEARBORN PARTNERS IV, L.P.

By: Madison Dearborn Partners, L.L.C.

Its: General Partner

By: 

/s/ Mark B. Tresnowski

Name: Mark B. Tresnowski

Title: Managing Director