Exhibit 24.1
                                                                    ------------
                            LIMITED POWER OF ATTORNEY
                                       FOR
                              SECTION 16(a) FILINGS
                              ---------------------

        Know all by these presents, that the undersigned hereby constitutes and
appoints each of Christie A. Hill and Kenneth D. Schwarz, signing singly, the
undersigned's true and lawful attorney-in-fact to:

        (1) Execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer, director and/or stockholder of Primus Telecommunications
Group, Incorporated (the "Company"), Forms 3, 4, and 5 and amendments thereto in
accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), and the rules thereunder;

        (2) Do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to complete and execute any such Form 3, 4,
or 5 and any amendments thereto and timely file such forms with the Securities
and Exchange Commission and any stock exchange or similar authority; and

        (3) Take any other action of any type whatsoever which, in the opinion
of such attorney-in-fact, may be necessary or desirable in connection with the
foregoing authority, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Limited Power of
Attorney shall be in such form and shall contain such terms and conditions as
such attorney-in-fact may approve in such attorney-in-fact's discretion.

        The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Exchange Act.

        This Limited Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4, and 5 with
respect to the undersigned's holdings of and transactions in securities issued
by the Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact. This Power of Attorney may be
filed with the Securities and Exchange Commission as a confirming statement of
the authority granted herein.

        IN WITNESS WHEREOF, the undersigned has caused this Limited Power of
Attorney to be executed as of this 7th day of July, 2011.

                                        /s/ Kenneth D. Schwarz
                                        ----------------------
                                        Kenneth D. Schwarz