AMENDMENT TO CONFIDENTIALITY AGREEMENT

Exhibit 99.1

AMENDMENT TO CONFIDENTIALITY AGREEMENT

     This Amendment to Confidentiality Agreement (“Amendment”) is entered into as of the 15th day of April, 2011, by and between Evolving Systems, Inc. (“Evolving Systems”) and Xxxxx Xxxxxx, as Trustee of the Singer Children’s Management Trust and Xxxx Xxxxxx (collectively, “Recipient”).

RECITALS

A. Evolving Systems and Recipient entered into a Confidentiality Agreement (“Agreement”), effective November 26, 2010, with a term initially extending through January 15, 2011 and subsequently extended through April 15, 2011; and

B. The parties desire to again extend the term of the Agreement as described below.

In consideration of the above and the covenants contained in this Agreement, the parties agree as follows:

1. Extension of Term of Agreement.

Section 5(b) of the Agreement is amended to state as follows:

(b) This Agreement shall be effective through April 22, 2011. No such termination shall affect the application of this Agreement to any disclosures made prior to the termination of this Agreement.

The remaining provisions of the Agreement shall continue in full force and effect.

IN WITNESS WHEREOF, the parties have executed this Amendment on the day and year first above written.

EVOLVING SYSTEMS, INC.								XXXX XXXXXX
By:		/s/ Xxxxx X. Xxxxxxx						/s/ Xxxx Xxxxxx
		Xxxxx X. Xxxxxxx
		Title: Sr. Vice President & General Counsel
								XXXXX XXXXXX, Trustee of the Singer Children’s
								Management Trust
								/s/ Xxxxx Xxxxxx

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