Exhibit 3.4

AMENDED AND RESTATED

BYLAWS

OF

T-MOBILE USA, INC.

ARTICLE I

OFFICES

Section 1. Registered Office. The registered office of T-Mobile USA, Inc. (the “Corporation”) shall be established and maintained at the office of Corporation Service Company, 2711 Centerville Road, Suite 400, in the City of Wilmington, County of New Castle, State of Delaware 19808, and Corporation Service Company shall be the registered agent of the Corporation in charge thereof.

Section 2. Other Offices. The Corporation may have other offices, either within or without the State of Delaware, at such place or places as the Board of Directors may from time to time select or the business of the Corporation may require.

ARTICLE II

MEETINGS OF STOCKHOLDERS

Section 1. Annual Meetings. Annual meetings of stockholders for the election of directors, and for such other business as may be stated in the notice of the meeting, shall be held at such place, either within or without the State of Delaware, and at such time and date as the Board of Directors, by resolution, shall determine and as set forth in the notice of the meeting. If the Board of Directors fails so to determine the time, date and place of meeting, the annual meeting of stockholders shall be held at the registered office of the Corporation on the first Friday in January. If the date of the annual meeting shall fall upon a legal holiday, the meeting shall be held on the next succeeding business day. At each annual meeting, the stockholders entitled to vote shall elect a Board of Directors and they may transact such other corporate business as shall be stated in the notice of the meeting.

Section 2. Special Meetings. Special meetings of the stockholders for any purpose or purposes may be called by the Chairman of the Board, the President or the Secretary, or by resolution of the Board of Directors.

Section 3. Voting. Each stockholder entitled to vote in accordance with the terms of the Certificate of Incorporation of the Corporation and these Bylaws may vote in person or by proxy, but no proxy shall be voted after three years from its date unless such proxy provides for a longer period. All elections for directors shall be decided by plurality vote; all other questions shall be decided by majority vote except as otherwise provided by the Certificate of Incorporation or the laws of the State of Delaware.

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A complete list of the stockholders entitled to vote at the meeting, arranged in alphabetical order, with the address of each, and the number of shares held by each, shall be open to the examination of any stockholder, for any purpose germane to the meeting, during ordinary business hours, for a period of at least ten days prior to the meeting, either at a place within the city where the meeting is to be held, which place shall be specified in the notice of the meeting, or, if not so specified, at the place where the meeting is to be held. The list shall also be produced and kept at the time and place of the meeting during the whole time thereof, and may be inspected by any stockholder who is entitled to be present.

Section 4. Quorum. Except as otherwise required by law, by the Certificate of Incorporation of the Corporation or by these Bylaws, the presence, in person or by proxy, of stockholders holding shares constituting a majority of the voting power of the Corporation shall constitute a quorum at all meetings of the stockholders. In case a quorum shall not be present at any meeting, a majority in interest of the stockholders entitled to vote thereat, present in person or by proxy, shall have the power to adjourn the meeting from time to time, without notice other than announcement at the meeting, until the requisite amount of stock entitled to vote shall be present. At any such adjourned meeting at which the requisite amount of stock entitled to vote shall be represented, any business may be transacted that might have been transacted at the meeting as originally noticed; but only those stockholders entitled to vote at the meeting as originally noticed shall be entitled to vote at any adjournment or adjournments thereof.

Section 5. Notice of Meetings. Written notice, stating the place, date and time of the meeting, and the general nature of the business to be considered, shall be given to each stockholder entitled to vote thereat, at his or her address as it appears on the records of the Corporation, not less than ten nor more than sixty days before the date of the meeting. No business other than that stated in the notice shall be transacted at any meeting without the unanimous consent of all the stockholders entitled to vote thereat.

Section 6. Action Without Meeting. Unless otherwise provided by the Certificate of Incorporation of the Corporation, any action required or permitted to be taken at any annual or special meeting of stockholders may be taken without a meeting, without prior notice and without a vote, if a consent in writing, setting forth the action so taken, shall be signed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted. Prompt notice of the taking of the corporate action without a meeting by less than unanimous written consent shall be given to those stockholders who have not consented in writing.

ARTICLE III

DIRECTORS

Section 1. Number and Term. The business and affairs of the Corporation shall be managed under the direction of a Board of Directors which shall consist of not less than one person. The exact number of directors shall initially be two (2) and may thereafter be fixed from time to time by the Board of Directors. Directors shall be elected at the annual meeting of stockholders and each director shall be elected to serve until his or her successor shall be elected and shall qualify. A director need not be a stockholder.

Section 2. Resignations. Any director may resign at any time. Such resignation shall be made in writing, and shall take effect at the time specified therein, and if no time be specified, at the time of its receipt by the Chairman of the Board, the President or the Secretary. The acceptance of a resignation shall not be necessary to make it effective.

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Section 3. Vacancies. If the office of any director becomes vacant, the remaining directors in the office, though less than a quorum, by a majority vote, may appoint any qualified person to fill such vacancy, who shall hold office for the unexpired term and until his or her successor shall be duly chosen. If the office of any director becomes vacant and there are no remaining directors, the stockholders, by the affirmative vote of the holders of shares constituting a majority of the voting power of the Corporation, at a special meeting called for such purpose, may appoint any qualified person to fill such vacancy.

Section 4. Removal. Except as hereinafter provided, any director or directors may be removed either for or without cause at any time by the affirmative vote of the holders of a majority of the voting power entitled to vote for the election of directors, at an annual meeting or a special meeting called for the purpose, and the vacancy thus created may be filled, at such meeting, by the affirmative vote of holders of shares constituting a majority of the voting power of the Corporation.

Section 5. Committees. The Board of Directors may, by resolution or resolutions passed by a majority of the whole Board of Directors, designate one or more committees, each committee to consist of one or more directors of the Corporation.

Any such committee, to the extent provided in the resolution of the Board of Directors, or in these Bylaws, shall have and may exercise all the powers and authority of the Board of Directors in the management of the business and affairs of the Corporation, and may authorize the seal of the Corporation to be affixed to all papers which may require it.

Section 6. Meetings. The newly elected directors may hold their first meeting for the purpose of organization and the transaction of business, if a quorum be present, immediately after the annual meeting of the stockholders; or the time and place of such meeting may be fixed by consent of all the Directors.

Regular meetings of the Board of Directors may be held without notice at such places and times as shall be determined from time to time by resolution of the Board of Directors.

Special meetings of the Board of Directors may be called by the Chairman of the Board or the President, or by the Secretary on the written request of any director, on at least one day’s notice to each director (except that notice to any director may be waived in writing by such director) and shall be held at such place or places as may be determined by the Board of Directors, or as shall be stated in the call of the meeting.

Unless otherwise restricted by the Certificate of Incorporation of the Corporation or these Bylaws, members of the Board of Directors, or any committee designated by the Board of Directors, may participate in any meeting of the Board of Directors or any committee thereof by means of a conference telephone or similar communications equipment by means of which all persons participating in the meeting can hear each other, and such participation in a meeting shall constitute presence in person at the meeting.

Section 7. Quorum. A majority of the Directors shall constitute a quorum for the transaction of business. If at any meeting of the Board of Directors there shall be less than a quorum present, a majority of those present may adjourn the meeting from time to time until a quorum is obtained, and no further notice thereof need be given other than by announcement at the meeting which shall be so adjourned. The vote of the majority of the Directors present at a meeting at which a quorum is present shall be the act of the Board of Directors unless the Certificate of Incorporation of the Corporation or these Bylaws shall require the vote of a greater number.

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Section 8. Compensation. Directors shall not receive any stated salary for their services as directors or as members of committees, but by resolution of the Board of Directors a fixed fee and expenses of attendance may be allowed for attendance at each meeting. Nothing herein contained shall be construed to preclude any director from serving the Corporation in any other capacity as an officer, agent or otherwise, and receiving compensation therefor.

Section 9. Action Without Meeting. Any action required or permitted to be taken at any meeting of the Board of Directors or of any committee thereof may be taken without a meeting if a written consent thereto is signed by all members of the Board of Directors or of such committee, as the case may be, and such written consent is filed with the minutes of proceedings of the Board of Directors or such committee.

ARTICLE IV

OFFICERS

Section 1. Officers. The officers of the Corporation shall be a President and a Secretary, both of whom shall be elected by the Board of Directors and shall hold office until their successors are duly elected and qualified. In addition, the Board of Directors may elect a Chairman of the Board, Chief Executive Officer, Chief Financial Officer, Chief Operating Officer, Controller and one or more Vice Presidents and such Assistant Secretaries and Assistant Controllers as they may deem proper. The Board of Directors may appoint such other officers and agents as it may deem advisable, who shall hold their offices for such terms and shall exercise such powers and perform such duties as shall be determined from time to time by the Board of Directors.

Section 2. President. The President shall have the general powers and duties of supervision and management usually vested in the office of President of a corporation. The President shall have the power to execute bonds, mortgages and other contracts on behalf of the Corporation, and to cause the seal to be affixed to any instrument requiring it, and when so affixed the seal shall be attested to by the signature of the Secretary or the Controller or an Assistant Secretary or an Assistant Controller.

Section 3. Vice Presidents. Each Vice President, if any, shall be elected and shall have such powers and shall perform such duties as shall be assigned to him or her by the Board of Directors.

Section 4. Secretary. The Secretary shall give, or cause to be given, notice of all meetings of stockholders and of the Board of Directors and all other notices required by law or by these Bylaws, and in case of his or her absence or refusal or neglect so to do, any such notice may be given by any person thereunto directed by the Chairman of the Board or the President, or by the Board of Directors, upon whose request the meeting is called as provided in these Bylaws. He or she shall record all the proceedings of the meetings of the Board of Directors, any committees thereof and the stockholders of the Corporation in a book to be kept for that purpose, and shall perform such other duties as may be assigned to him or her by the Board of Directors, the Chairman of the Board or the President. He or she shall have the custody of the seal of the Corporation and shall affix the same to all instruments requiring it, when authorized by the Board of Directors, the Chairman of the Board or the President, and attest to the same.

Section 5. Assistant Secretaries and Assistant Controllers. Assistant Secretaries and Assistant Controllers, if any, shall be elected and shall have such powers and shall perform such duties as shall be assigned to them, respectively, by the Board of Directors.

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ARTICLE V

MISCELLANEOUS

Section 1. Certificates of Stock. The interest of each stockholder of the Corporation may be evidenced by certificates for shares of stock in such form as the appropriate officers of the Corporation may from time to time prescribe or be uncertificated.

The shares of the stock of the Corporation shall be transferred on the books of the Corporation, in the case of certificated shares of stock, by the holder thereof in person or by his or her attorney duly authorized in writing, upon surrender for cancellation of certificates for at least the same number of shares, with an assignment and power of transfer endorsed thereon or attached thereto, duly executed, with such proof of the authenticity of the signature as the Corporation or its agents may reasonably require; and, in the case of uncertificated shares of stock, upon receipt of proper transfer instructions from the registered holder of the shares or by such person’s attorney duly authorized in writing, and upon compliance with appropriate procedures for transferring shares in uncertificated form. No transfer of stock shall be valid as against the Corporation for any purpose until it shall have been entered in the stock records of the Corporation by an entry showing from and to whom transferred.

The certificates of stock shall be signed, countersigned and registered in such manner as the Board of Directors may by resolution prescribe, which resolution may permit all or any of the signatures on such certificates to be in facsimile. In case any officer, transfer agent or registrar who has signed or whose facsimile signature has been placed upon a certificate has ceased to be such officer, transfer agent or registrar before such certificate is issued, it may be issued by the Corporation with the same effect as if he or she were such officer, transfer agent or registrar at the date of issue.

The Board of Directors shall have the power and authority to make such rules and regulations as it may deem necessary or proper concerning the issue, transfer and registration of shares of stock of the Corporation in both the certificated and uncertificated form.

Section 2. Lost Certificates. A new certificate of stock may be issued in the place of any certificate theretofore issued by the Corporation, alleged to have been lost or destroyed, and the Board of Directors may, in its discretion, require the owner of the lost or destroyed certificate, or such owner’s legal representatives, to give the Corporation a bond, in such sum as they may direct, not exceeding double the value of the stock, to indemnify the Corporation against any claim that may be made against it on account of the alleged loss of any such certificate, or the issuance of any such new certificate.

Section 3. Stockholders’ Record Date. In order that the corporation may determine the stockholders entitled to notice of, or to vote at, any meeting of stockholders or any adjournment thereof, or to express consent to corporate action in writing without a meeting, or entitled to receive payment of any dividend or other distribution or allotment of any rights, or entitled to exercise any rights in respect of any change, conversion or exchange of stock or for the purpose of any other lawful action, the Board of Directors may fix, in advance, a record date, that shall not be more than sixty nor less than ten days before the date of such meeting, nor more than sixty days prior to any other action. A determination of stockholders of record entitled to notice of or to vote at a meeting of stockholders shall apply to any adjournment of the meeting; provided, however, that the Board of Directors may fix a new record date for the adjourned meeting.

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Section 4. Dividends. Subject to the provisions of the Certificate of Incorporation of the Corporation, the Board of Directors may, out of funds legally available therefor at any regular or special meeting, declare dividends upon stock of the Corporation as and when they deem appropriate. Before declaring any dividend there may be set apart out of any funds of the Corporation available for dividends, such sum or sums as the Board of Directors from time to time in their discretion deem proper for working capital or as a reserve fund to meet contingencies or for equalizing dividends or for such other purposes as the Board of Directors shall deem conducive to the interests of the Corporation.

Section 5. Seal. The corporate seal, if any, of the Corporation shall be in such form as shall be determined by resolution of the Board of Directors. Said seal may be used by causing it or a facsimile thereof to be impressed or affixed or reproduced or otherwise imprinted upon the subject document or paper.

Section 6. Fiscal Year. The fiscal year of the Corporation shall be determined by resolution of the Board of Directors.

Section 7. Checks. All checks, drafts or other orders for the payment of money, notes or other evidences of indebtedness issued in the name of the Corporation shall be signed by such officer or officers, or agent or agents, of the Corporation, and in such manner as shall be determined from time to time by resolution of the Board of Directors.

Section 8. Notice and Waiver of Notice. Whenever any notice is required to be given under these Bylaws, personal notice is not required unless expressly so stated, and any notice so required shall be deemed to be sufficient if given by depositing the same in the United States mail, postage prepaid, addressed to the person entitled thereto at his or her address as it appears on the records of the Corporation, and such notice shall be deemed to have been given on the day of such mailing. Stockholders not entitled to vote shall not be entitled to receive notice of any meetings except as otherwise provided by law. Whenever any notice is required to be given under the provisions of any law, or under the provisions of the Certificate of Incorporation of the Corporation or of these Bylaws, a waiver thereof, in writing and signed by the person or persons entitled to said notice, whether before or after the time stated therein, shall be deemed equivalent to such required notice.

ARTICLE VI

AMENDMENTS

These Bylaws may be altered, amended or repealed at any annual meeting of the stockholders (or at any special meeting thereof if notice of such proposed alteration, amendment or repeal to be considered is contained in the notice of such special meeting) by the affirmative vote of the holders of shares constituting a majority of the voting power of the Corporation. Except as otherwise provided in the Certificate of Incorporation of the Corporation, the Board of Directors may by majority vote of those present at any meeting at which a quorum is present alter, amend or repeal these Bylaws, or enact such other Bylaws as in their judgment may be advisable for the regulation and conduct of the affairs of the Corporation.

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