ARCH WIRELESS INC
EXHIBIT 10.3 SUPPLEMENTAL INDENTURE
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<DESCRIPTION>EXHIBIT 10.3 SUPPLEMENTAL INDENTURE
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<P ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Exhibit 10.3 </B></FONT></P>
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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SUPPLEMENTAL INDENTURE </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SUPPLEMENTAL
INDENTURE (this &#147;Supplemental Indenture&#148;) executed as of June 12, 2003, by and
among Arch Wireless Holdings, Inc., a Delaware corporation (the &#147;Company&#148;), Arch
Wireless Communications, Inc., a Delaware corporation (&#147;Arch&#148;), Arch Wireless,
Inc., a Delaware corporation (the &#147;Parent&#148;), and the direct and indirect
subsidiaries of the Parent listed on <U>Schedule I</U> hereto (such subsidiaries, the
&#147;Subsidiary Guarantors,&#148; and together with Arch and the Parent, herein the
&#147;Guarantors&#148;) and The Bank of New York, a New York banking corporation, as
Trustee (the &#147;Trustee&#148;). </FONT></P>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>RECITALS </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS,
the Company, the Guarantors and the Trustee have heretofore executed and delivered that
certain Indenture, dated as of May 29, 2002, as amended by the Supplemental Indenture
dated as of August 14, 2002 and as further amended by the Supplemental Indenture dated
March 6, 2003 (the &#147;Indenture&#148;), with respect to the Company&#146;s 12%
Subordinated Secured Compounding Notes Due 2009 (the &#147;Notes&#148;); </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS,
Section 8.02 of the Indenture provides that the Company and the Guarantors, when
authorized by a Board Resolution, and the Trustee, together with the written consent of
the Majority Noteholders, may, under certain circumstances, enter into an indenture or
indentures supplemental to the Indenture for the purpose of adding any provisions to or
changing in any manner or eliminating or waiving (subject to Section 4.03 of the
Indenture) any of the provisions of the Indenture or of modifying in any manner the rights
of the Holders under the Indenture; </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS,
the Company desires to amend a certain section of the Indenture to revise or supplement
the text of certain terms of the Indenture, and in connection therewith, the Company has
been soliciting written consents of the Holders to the amendments to the Indenture set
forth herein (and to the execution of this Supplemental Indenture), and the Company has
now obtained such written consents from the Holders of a majority in the aggregate
principal amount of the outstanding Notes; accordingly, this Supplemental Indenture and
the amendments set forth herein are authorized pursuant to Section 8.02 of the Indenture;
and </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS,
the execution and delivery of this Supplemental Indenture has been duly authorized by the
parties hereto, and all other acts necessary to make this Supplemental Indenture a valid
and binding supplement to the Indenture, effectively amending and supplementing the
Indenture as set forth herein, have been duly taken; </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NOW,
THEREFORE, in consideration of the above premises and for other good and valuable
consideration, the receipt of which is hereby acknowledged, it is mutually agreed, for the
equal and proportionate benefit of all Holders, as follows: </FONT></P>


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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>ARTICLE ONE </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon
execution of this Supplemental Indenture by the Company and the parties hereto, then
automatically (without further act by any person) with respect to all outstanding Notes,
the Indenture is hereby amended in the following respects: </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.1
Section 10.09 of the Indenture shall hereby be amended by adding after the last sentence
thereof, the following: </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#147;Notwithstanding
anything set forth in this Section 10.09, the Parent shall be allowed to consummate a
merger with Arch 382 Corporation, a Delaware corporation and a wholly owned subsidiary of
the Parent (&#147;Arch 382&#148;), pursuant to that certain Agreement and Plan of Merger
between the Parent and Arch 382 dated May 6, 2003.&#148; </FONT></P>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>ARTICLE TWO </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.1
All terms used in this Supplemental Indenture which are defined in the Indenture and not
otherwise defined herein shall have the meanings assigned to such terms in the Indenture. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.2
All of the provisions of this Supplemental Indenture shall be deemed to be incorporated
in, and made part of, the Indenture, and the Indenture, as amended and supplemented by
this Supplemental Indenture, shall be read, taken and construed as one and the same
instrument and shall be binding upon all the Holders. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.3
This Supplemental Indenture may be executed in any number of counterparts, each of which
so executed shall be deemed to be an original, but all such counterparts shall together
constitute but one and the same instrument. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.4
In case any provision in this Supplemental Indenture shall be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining provisions shall
not in any way be affected or impaired thereby. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.5
Nothing in this Supplemental Indenture, express or implied, shall give any person, other
that the parties hereto and their successors hereunder and the Holders, any benefit or any
legal or equitable right, remedy or claim under this Supplemental Indenture. Except as
expressly supplemented or amended as set forth in this Supplemental Indenture, the
Indenture is hereby ratified and confirmed, and all the terms, provisions and conditions
thereof shall be and continue in full force and effect. The Trustee accepts the trusts
created by the Indenture, as amended and supplemented by this Supplemental Indenture, and
agrees to perform the same upon the terms and conditions in the Indenture as amended and
supplemented by this Supplemental Indenture. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.6
The Trustee shall not be responsible in any matter whatsoever for or in respect of the
validity or sufficiency of this Supplemental Indenture, except with respect to the
execution hereof by the Trustee, or for or in respect of the recitals contained herein,
all of which are made solely by the Company and the Guarantors. </FONT></P>


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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IN
WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed, all as of the day and year first written above. </FONT></P>


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     <TD WIDTH="50%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless, Inc.</FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless Holdings, Inc.</FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless Communications, Inc.</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">MobileMedia Communications, Inc.</FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless Operating Company, Inc.</FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless License Co., LLC</FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Paging Network International, Inc.</FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Paging Network Canadian Holdings, Inc.</FONT></TD></TR>
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<TD WIDTH=50%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>As to each of the foregoing:<BR><BR>
<BR>By:    /S/ GERALD J. CIMMINO<BR>&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;<BR>
Name: Gerald J. Cimmino<BR>Title: Treasurer</FONT></TD>
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<TD WIDTH=50%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>The Bank of New York, as Indenture Trustee Collateral Agent<BR><BR>
<BR>By:    /S/ KISHA A. HOLDER<BR>&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;<BR>
Name: Kisha A. Holder<BR>Title: Assistant Vice President</FONT></TD>
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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Schedule I </U></FONT></P>


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     <TD WIDTH="50%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless, Inc.</FONT></TD>
     <TD WIDTH="50%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless Communications, Inc.</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">MobileMedia Communications, Inc.</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless Operating Company, Inc.</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch Wireless License Co., LLC</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Paging Network International, Inc.</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Paging Network Canadian Holdings, Inc.</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD></TR>
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     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Arch 382 Corporation</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD></TR>
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