AGREEMENT OF JOINT FILING IPCS, INC.

Exhibit 1

AGREEMENT OF JOINT FILING

IPCS, INC.

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned hereby confirm the agreement by and among them to the joint filing on behalf of them of Amendment No. 1 to Statement on Schedule 13D and any and all further amendments thereto, with respect to the above referenced securities and that this Agreement be included as an Exhibit to such filing.  This Agreement may be executed in any number of counterparts each of which shall be deemed to be an original and all of which together shall be deemed to constitute one and the same Agreement.

IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of this 18th day of May 2007.

	APOLLO INVESTMENT FUND IV, L.P.
	By:	APOLLO ADVISORS IV, L.P.
		Its General Partner
		By:		APOLLO CAPITAL MANAGEMENT IV, INC.
				Its General Partner
				By:	/s/Xxxxxx X. Xxxxxx
					Xxxxxx X. Xxxxxx
					Vice President
	APOLLO OVERSEAS PARTNERS IV, L.P.
	By:	APOLLO ADVISORS IV, L.P.
		Its Managing General Partner
		By:		APOLLO CAPITAL MANAGEMENT IV, INC.
				Its General Partner
				By:	/s/Xxxxxx X. Xxxxxx
					Xxxxxx X. Xxxxxx
					Vice President
	APOLLO ADVISORS IV, L.P.
	By:	APOLLO CAPITAL MANAGEMENT IV, INC.
		Its General Partner
		By:	/s/Xxxxxx X. Xxxxxx
			Xxxxxx X. Xxxxxx
			Vice President

	APOLLO MANAGEMENT IV, L.P.
	By:	AIF IV MANAGEMENT, INC.
		Its Co-general Partner
		By:	/s/Xxxxxx X. Xxxxxx
			Xxxxxx X. Xxxxxx
			Vice President
	APOLLO MANAGEMENT, L.P.
	By:	AIF IV MANAGEMENT GP, LLC
		Its General Partner
		By:	/s/Xxxxxx X. Xxxxxx
			Xxxxxx X. Xxxxxx
			Vice President