AMENDMENT # 4 TO EMPLOYMENT AGREEMENT

Exhibit 10.17

December 14, 2005

Mr. Michael E. Kalogris
1100 Cassatt Road
Berwyn, PA 19312

Dear Mr. Kalogris:

     You previously entered into an employment agreement with SunCom Wireless Management Company, Inc. (f/k/a Triton Management Company, Inc.) (the “Company”) and its parent, SunCom Wireless PCS Holdings, Inc. (f/k/a Triton PCS Holdings, Inc.) (“SunCom”), dated as of February 4, 1998 (the “Original Employment Agreement”) and thereafter amended by an Amendment No. 1 dated June 30, 1998, an Amendment No. 2 dated December 31, 1998, an Amendment No. 3 dated June 8, 1999, a certain Letter Agreement (the “2003 Letter Agreement”) dated May 6, 2003, and a certain Letter Agreement (the "2005 Letter Agreement”) dated December 2, 2005. The Original Employment Agreement as amended by Amendments Nos. 1, 2 and 3, the 2003 Letter Agreement and the 2005 Letter Agreement is referred to herein as the “Existing Employment Agreement”. Except as otherwise defined herein, all capitalized terms used herein shall have the meanings set forth in the Existing Employment Agreement.

     The Existing Employment Agreement’s current term of three (3) years is scheduled to expire on February 3, 2006 and will automatically renew for successive one-year extensions in the absence of either party providing a notice of nonrenewal. On behalf of SunCom and the Company, in light of the services performed by you as SunCom’s Chairman and Chief Executive Officer and as the Company’s Chief Executive Officer, SunCom and the Company in this letter agreement (this “Agreement”) hereby agree to modify the terms of your Existing Employment Agreement as set forth below:

     1. Term. The term of your employment, as amended hereby, shall be extended until and shall continue through February 3, 2010 (the “New Expiration Date”), unless earlier terminated in accordance with the terms of the Existing Employment Agreement. The term will extend automatically for successive one-year periods commencing on such date unless either party provides written notice to the other party at least sixty (60) days prior to any renewal date.

     2. Base Salary. Effective January 1, 2006, your base salary under your employment contract shall be increased to five hundred thousand dollars ($500,000). Thereafter, the Compensation Committee of the Board of Directors of SunCom (the “Committee”) shall review your base salary and may, in its discretion, increase (but not decrease) such base salary as it deems appropriate.

     3. Contractual Payment Subject to Forfeiture. In consideration for your execution and delivery of this Agreement, you will be entitled to receive an additional payment in the amount of five hundred thousand dollars ($500,000). Such amount will be paid to you in a single lump sum on the first regular payroll date occurring during calendar year 2006. Notwithstanding the foregoing, you shall be required to return a portion of this payment in the

Mr. Michael E. Kalogris
December 20, 2005
Page 2

event that prior to February 3, 2009 (the “Forfeiture Date”) (i) you resign from employment (other than for Good Reason) or (ii) your employment is terminated for Cause. The portion of the payment to be repaid to the Company in such event shall be equal to the amount of the payment multiplied by a fraction, the numerator of which is the number of full calendar months remaining between the date of any such resignation or termination and the Forfeiture Date, and the denominator of which is 36. Such amount shall be repaid to the Company within five (5) business days following any such resignation or termination.

     4. Annual Bonus. The parties acknowledge and agree that: (i) Schedule II of the Existing Employment Agreement shall no longer be effective or binding upon the parties; (ii) the “Bonus Target” for purpose of calculating the annual bonus payable to Executive shall be 100% of his Base Salary; and (iii) the amount of Executive’s annual bonus shall be calculated by multiplying the Bonus Target by the percentage of the goals associated with that year’s bonus Executive achieved during such year. By of illustration, if Executive achieves in a given year 50% of the goals associated with that year’s annual bonus, he will be entitled to 50% of the Bonus Target; if Executive achieves in a given year 120% of such goals, he will be entitled to 120% of the Bonus Target.

     5. Other Permitted Activities. From and after February 4, 2006: (i) Section 8 of the 2003 Letter Agreement shall no longer be effective; and (ii) the third sentence of Section 2 of the Original Employment Agreement shall be amended and restated in its entirety to read as follows:

“Nothing contained herein shall preclude Executive from: (i) serving on the board of directors (or equivalent body) of up to two (2) other for-profit business corporations or entities with the consent of the Board of Directors of SunCom (which consent shall not be unreasonably withheld, conditioned or delayed); (ii) serving on the board (or comparable governing body) of, or working for, any charitable or community organization or any trade association; (iii) serving on the board of advisors of WallerSutton 2000, LP (which shall be deemed to be one of the two permitted Board memberships under clause (i) above); (iv) pursuing his personal financial and legal affairs; and (v) serving on the board of directors (or comparable governing body) of SunCom or any direct or indirect Subsidiary of SunCom (including the Company) so long as such activities referred to in clauses (i) through (v), individually or collectively, do not interfere in any material respect with the performance of Executive’s duties hereunder.”

     6. Perquisites. Notwithstanding Section 4(b) (or any other provision) of the Existing Employment Agreement, Executive, from and after January 1, 2006, shall be entitled to: (i) a monthly automobile allowance of $1,800; (ii) tax advisory, preparation and related services from SunCom’s independent accountants at the Company’s expense, not to exceed $5,000 in any calendar year; (iii) a driver of Executive’s choosing to be engaged or employed by the Company to transport Executive to and from the airport and to out-of-town business-related meetings and other functions; and (iv) compensation for vacation days not used by Executive during any

Mr. Michael E. Kalogris
December 20, 2005
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calendar year (based upon Executive’s Base Salary during such calendar year), payable not later than January 31^st of the following calendar year.

     7. Stock Awards. Executive shall be eligible to receive additional awards under SunCom’s 1999 Stock and Incentive Plan (or any successor thereto) (the “Plan”) under the terms of the Plan as may be approved by the Committee from time to time.

     8. Benefits Upon Termination. Notwithstanding Sections 5(b) and 5(c) (or any other provision) of the Existing Employment Agreement, in the event of a termination of Executive’s employment (i) by reason of his death or Disability, (ii) by the Company Without Cause, (iii) by the Company by notice of non-renewal pursuant to Section 1 of this Agreement, or (iv) by Executive for Good Reason, then Executive shall be entitled (in addition to any other benefits, payments or compensation provided for in the Existing Employment Agreement) to:

          (a) a severance benefit in the amount of his Base Salary in effect on the date of such termination;

          (b) an annual bonus for the calendar year during which such termination occurs (without regard to when during such year such termination occurs) calculated (i) in accordance with Section 4 hereof and (ii) as if Executive had achieved 100% of his bonus-based goals for such calendar year; and

          (c) immediate vesting of all unvested shares of SunCom owned by Executive as of the date of such termination (whether such shares are subject to the Plan or a restricted stock award letter agreement or comparable agreement).

          The benefits described in Sections 8(a) and 8(b) above shall be payable in a single lump sum as soon as practicable, but in no event more than ten (10) business days, following the end of the Employment Period; provided that in the event that such benefits constitute “deferred compensation” payable to a “key employee” of a publicly-traded corporation pursuant to Section 409A of the Internal Revenue Code of 1986, as amended, such benefits shall not be payable until six months following Executive’s separation from service.

     9. Territory. From and after the date hereof, the term “Territory” as used in Section 6(a) of the Existing Employment Agreement shall mean:

          (a) With respect to Executive’s non-competition obligations during the Employment Period, the geographic areas in which SunCom and its direct and indirect Subsidiaries (including the Company) do business during the Employment Period; and

          (b) With respect to Executive’s non-competition obligations during the one-year period following the Employment Period, the geographic areas in which SunCom and its direct and indirect Subsidiaries (including the Company) are doing business as of the termination date of Executive’s employment with the Company.

     10. Dispute Resolution. Section 9(n) of the Existing Employment Agreement is hereby by amended to add the following sentence to the end of such provision:

Mr. Michael E. Kalogris
December 20, 2005
Page 4

“Notwithstanding the foregoing, the parties agree that prior to the commencement of any arbitration proceedings to resolve any dispute, controversy or claim arising in connection with this Agreement, the parties shall, upon the request of any party, attempt in good faith to resolve such dispute, controversy or claim through non-binding mediation pursuant to the Commercial Mediation Rules of the AAA. All costs and expenses incurred by Executive in connection with such mediation proceeding (including, without limitation, reasonable attorneys’ fees) shall be paid and/or reimbursed by the Company.”

     11. All Other Provisions Remain Effective. Except as otherwise expressly modified under this Agreement, all other terms and conditions of the Existing Employment Agreement shall continue in full force and effect and are hereby ratified and confirmed. In the event of any inconsistency between the terms of the Existing Employment Agreement and the terms of this Agreement, the terms of this Agreement shall control. The parties acknowledge and agree that Section 5 of the 2003 Letter Agreement shall not be effective or binding upon Executive from and after February 3, 2006.

     12. Notices. Any notice required or desired to be delivered under this Agreement shall be in writing and shall be delivered personally against receipt, by courier service or by registered mail, return receipt requested, and shall be effective upon actual receipt by the party to which such notice shall be directed, and shall be addressed as follows (or to such other address as the party entitled to notice shall hereafter designate in accordance with the terms hereof):

If to SunCom or the Company, to the attention of the Chairman of the Committee at SunCom’s principal executive offices, with a copy to:

Dow, Lohnes & Albertson, PLLC
1200 New Hampshire Avenue, N.W.
Washington, D.C. 20036
Attention: Leonard J. Baxt
Facsimile: (202)  ###-###-####

If to Executive:

Mr. Michael E. Kalogris
1100 Cassatt Road
Berwyn, PA 19312

with a copy to:

Kleinbard Bell & Brecker LLP
1900 Market Street, Suite 700
Philadelphia, PA 19103
Attention: Howard J. Davis

Mr. Michael E. Kalogris
December 20, 2005
Page 5

          Facsimile: (215)  ###-###-####

     Please evidence your acceptance of the foregoing modifications to the Existing Employment Agreement by executing this Agreement where provided below and returning it to me, whereupon this Agreement shall constitute the legally valid and binding obligation of the parties hereto, enforceable against such parties in accordance with its terms, and future references to your Employment Agreement shall mean the Existing Employment Agreement as amended by this Agreement.

[Signature Page Follows]

Mr. Michael E. Kalogris
December 20, 2005
Page 6

     Pending execution of this Agreement or in the event you elect not to accept this offer, your employment shall continue under the terms of the Existing Employment Agreement including the automatic extension of the Employment Period as provided therein.