<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>e601562_ex99-1.txt
<DESCRIPTION>AGREEMENT REGARDING JOINT FILING
<TEXT>

                                  EXHIBIT 99.1

                     AGREEMENT REGARDING JOINT FILING UNDER
                     UNDER RULE 13D-1(K) OF THE EXCHANGE ACT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as
amended, each of the undersigned agrees to the filing on behalf of each of a
Statement on Schedule 13G, and all amendments thereto, with respect to the
shares of Common stock of UTSTARCOM INC.

Date: February 12, 2007
                                                  /s/ James H. Simons
                                                  ------------------------------
                                                         James H. Simons


                                                  Renaissance Technologies Corp.

                                                  By: /s/ Mark Silber
                                                      --------------------------
                                                      Mark Silber
                                                      Vice President


                               Page 8 of 8 Pages
</TEXT>
</DOCUMENT>
