JOINT FILING AGREEMENT
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Exhibit
B
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The undersigned hereby
agree that the Statement on Schedule 13G, dated
August 20, 2007 with respect to
the shares of Common Stock
of Inphonic, Inc. and any
further amendments thereto executed by each and any
of us shall be filed on behalf of each of us pursuant to and
in accordance with the provisions of
Rule 13d-1(k)(1) under
the Securities Exchange Act of 1934, as
amended.
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This Agreement may
be executed in separate counterparts, each of which
shall be deemed an original, but all of which shall constitute one
and
the
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same
instrument.
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Dated:
August 22, 2007
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By:
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/s/
Xxxx X. Xxxxx
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Xxxx
X. Xxxxx, Managing Member
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POTOMAC
CAPITAL MANAGEMENT INC.
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By:
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/s/
Xxxx X. Xxxxx
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Xxxx
X.Xxxxx, President
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XXXX
X. XXXXX
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By:
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/s/
Xxxx X. Xxxxx
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Xxxx
X.Xxxxx
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