EXHIBIT 10.8.7 CONFORMED COPY SIXTH AMENDMENT, dated as of April 7, 1999 (this "Amendment"), to the --------- Credit Agreement, dated as of July 17, 1998 (as amended, supplemented or otherwise modified from time to time, the "Credit Agreement"), among TELECORP ---------------- PCS, INC., a corporation organized under the laws of the State of Delaware (the "Borrower"), the several banks and other financial institutions and entities -------- from time to time parties thereto (the "Lenders"), and THE CHASE MANHATTAN BANK, ------- as administrative agent (the "Administrative Agent") for the Lenders. -------------------- WHEREAS, pursuant to the Credit Agreement, the Lenders have agreed to make certain loans to the Borrower; and WHEREAS the Borrower has requested that certain provisions of the Credit Agreement be modified in the manner provided for in this Amendment, and the Lenders are willing to agree to such modifications as provided for in this Amendment. NOW, THEREFORE, the parties hereto hereby agree as follows: 1. Defined Terms. Capitalized terms used and not defined herein -------------- shall have the meanings given to them in the Credit Agreement, as amended hereby. 2. Amendment to the Credit Agreement. Section 6.13(a) of the Credit ---------------------------------- Agreement is hereby amended by deleting the amount "$30,000,000" immediately before the semicolon at the end thereof and substituting therefor "$33,000,000 at any one time outstanding". 3. No Other Amendments; Confirmation. Except as expressly amended, ---------------------------------- waived, modified and supplemented hereby, the provisions of the Credit Agreement are and shall remain in full force and effect. 4. Representations and Warranties. The Borrower hereby represents ------------------------------- and warrants to the Administrative Agent and the Lenders as of the date hereof: (a) No Default or Event of Default has occurred and is continuing. (b) The execution, delivery and performance by the Borrower of this Amendment have been duly authorized by all necessary corporate and other action and do not and will not require any registration with, consent or approval of, notice to or action by, any person (including any governmental agency) in order to be effective and enforceable. The Credit Agreement as amended by this Amendment constitutes the legal, valid and binding obligation of the Borrower, enforceable against each in accordance with its terms, subject only to the operation of the Bankruptcy Code and other similar statutes for the benefit of debtors generally and to the application of general equitable principles. (c) All representations and warranties of the Borrower contained in the Credit Agreement (other than representations or warranties expressly made only on and as of the Effective Date) are true and correct as of the date hereof. 5. Effectiveness. This Amendment shall become effective only upon -------------- the satisfaction in full of the following conditions precedent: (a) The Administrative Agent shall have received counterparts hereof, duly executed and delivered by the Borrower and the Required Lenders. (b) The Administrative Agent shall have received such opinions and certificates from the Borrower and its counsel relating to this Amendment as it may reasonably request in form reasonably satisfactory to its counsel. (c) The Administrative Agent shall have received proof, reasonably satisfactory to it, that the Equity Commitments shall have been increased to $30,000,000. 6. Expenses. The Borrower agrees to reimburse the Administrative --------- Agent for its out-of-pocket expenses in connection with this Amendment, including the reasonable fees, charges and disbursements of Cravath, Swaine & Moore, counsel for the Administrative Agent. 7. Governing Law; Counterparts. (a) This Amendment and the rights ---------------------------- and obligations of the parties 3 hereto shall be governed by, and construed and interpreted in accordance with, the laws of the State of New York. (b) This Amendment may be executed by one or more of the parties to this Amendment on any number of separate counterparts, and all of said counterparts taken together shall be deemed to constitute one and the same instrument. This Amendment may be delivered by facsimile transmission of the relevant signature pages hereof. IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and delivered by their respective proper and duly authorized officers as of the day and year first above written. TELECORP, PCS, INC. by /s/ Thomas H. Sullivan ------------------------------- Name: Thomas H. Sullivan Title: CFO THE CHASE MANHATTAN BANK, by /s/ William E. Rottino ------------------------------- Name: William E. Rottino Title: Vice President THE BANK OF NEW YORK, by /s/ Gerry Granovksy ------------------------------- Name: Gerry Granovsky Title: Vice President BANK OF TOKYO MITSUBISHI TRUST COMPANY, by /s/ Michael Deadder ------------------------------- Name: Michael Deadder Title: Vice President 4 BANKBOSTON, N.A., by /s/ Jonathan D. Sharkey --------------------------------- Name: Jonathan D. Sharkey Title: Vice President BANKERS TRUST COMPANY, by /s/ Gregory Shefrin --------------------------------- Name: Gregory Shefrin Title: Principal CANADIAN IMPERIAL BANK OF COMMERCE, by CIBC Oppenheimer Corp., as Agent, by /s/ Christine Harrigan --------------------------------- Name: Christine Harrigan Title: Executive Director THE CIT GROUP/EQUIPMENT FINANCING, INC. by /s/ J.E. Palmer --------------------------------- Name: J.E. Palmer Title: Assistant Vice President CAPTIVA III FINANCE, LTD., as advised by Pacific Investment Management Company, by /s/ [SIGNATURE ILLEGIBLE] --------------------------------- Name: Title: 5 DELANO COMPANY, by Pacific Investment Management Company as its Investment Advisor, by /s/ [ILLEGIBLE SIGNATURE] --------------------------------- Name: Title: FLEET NATIONAL BANK, by /s/ William Weiss --------------------------------- Name: William Weiss Title: Assistant Vice President GENERAL ELECTRIC CAPITAL CORPORATION, by /s/ Mark F. Mylon --------------------------------- Name: Mark F. Mylon Title: Manager-Operations KZH APPALOOSA LLC, by /s/ Virginia Conway --------------------------------- Name: Virginia Conway Title: Authorized Agent KZH IV LLC, by /s/ Virginia Conway --------------------------------- Name: Virginia Conway Title: Authorized Agent 6 KZH PAMCO LLC, by /s/ Virginia Conway ------------------------------- Name: Virginia Conway Title: Authorized Agent PAMCO CAYMAN LTD., by Highland Capital Management, L.P., as Collateral Manager, by /s/ Mark K. Okada --------------------------------- Name: Mark K. Okada, CFA Title: Executive Vice President SYNDICATED LOAN FUNDING TRUST, by Lehman Commercial Paper Inc., not in its individual capacity but solely as Asset Manager, by /s/ Michele Swanson --------------------------------- Name: Michele Swanson Title: Authorized Signatory LEHMAN COMMERCIAL PAPER INC. by /s/ Michele Swanson --------------------------------- Name: Michele Swanson Title: Authorized Signatory TORONTO DOMINION [TEXAS], INC., by /s/ Anne C. Favoriti --------------------------------- Name: Anne C. Favoriti Title: Vice President 7 VAN KAMPEN PRIME RATE INCOME TRUST, by /s/ Jeffrey W. Maillet --------------------------------- Name: Jeffrey W. Maillet Title: Senior Vice President & Director VAN KAMPEN SENIOR FLOATING RATE FUND, by /s/ Jeffrey W. Maillet --------------------------------- Name: Jeffrey W. Maillet Title: Senior Vice President & Director VAN KAMPEN SENIOR INCOME TRUST, by /s/ Jeffrey W. Maillet --------------------------------- Name: Jeffrey W. Maillet Title: Senior Vice President & Director MOUNTAIN CLO TRUST, by /s/ [SIGNATURE ILLEGIBLE] --------------------------------- Name: Title: FRANKLIN FLOATING RATE TRUST, by /s/ [SIGNATURE ILLEGIBLE] --------------------------------- 8 Name: Title: MORGAN GUARANTY TRUST COMPANY OF NEW YORK, by /s/ Gery Sampere --------------------------------- Name: Gery Sampere Title: Vice President DEBT STRATEGIES FUND, INC. by /s/ [SIGNATURE ILLEGIBLE] --------------------------------- Name: Title: MERRILL LYNCH ASSET MANAGEMENT, by /s/ [SIGNATURE ILLEGIBLE] --------------------------------- Name: Title: MERRILL LYNCH PRIME RATE PORTFOLIO, INC., by /s/ [SIGNATURE ILLEGIBLE] --------------------------------- Name: Title: MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., by /s/ [SIGNATURE ILLEGIBLE] --------------------------------- Name: Title: 9 SENIOR HIGH INCOME PORTFOLIO, INC., by /s/ [SIGNATURE ILLEGIBLE] ---------------------------------- Name: Title: