Announcement by PRIMUS Telecommunications Under Nasdaq Rule 4350

Business Wire, March 28, 2006

MCLEAN, Va. -- PRIMUS Telecommunications Group, Incorporated (NASDAQ:PRTL), an integrated communications services provider, today disclosed under Nasdaq Marketplace Rule 4350(b)(1)(B) that the Company's independent registered public accounting firm included a going concern explanation paragraph in its report filed with the Company's Annual Report on Form 10-K for the year ended December 31, 2005. The disclosure in this press release is required under the above Nasdaq rule and does not represent any change to the Company's recently filed Annual Report on Form 10-K.

PRIMUS Telecommunications Group, Incorporated (NASDAQ:PRTL) is an integrated communications services provider offering international and domestic voice, voice-over-Internet protocol (VOIP), Internet, wireless, data and hosting services to business and residential retail customers and other carriers located primarily in the United States, Canada, Australia, the United Kingdom and western Europe. PRIMUS provides services over its global network of owned and leased transmission facilities, including approximately 350 points-of-presence (POPs) throughout the world, ownership interests in undersea fiber optic cable systems, 16 carrier-grade international gateway and domestic switches, and a variety of operating relationships that allow it to deliver traffic worldwide. Founded in 1994, PRIMUS is based in McLean, Virginia.