Exhibit 99.1

              InterDigital Updates Guidance for First Quarter 2007

      Recurring Royalties and Additional Royalty Payments Benefit
                                Quarter


    KING OF PRUSSIA, Pa.--(BUSINESS WIRE)--April 18,
2007--InterDigital Communications Corporation (NASDAQ:IDCC) today
announced that it expects total first quarter 2007 revenue to be in
the approximate range of $67 million to $68 million. This expectation
reflects updated royalty reports which include additional royalties
related to sales of covered products identified in a routine audit
conducted by the company.

    Expected revenues for first quarter 2007 include the following
approximate amounts:

    --  $57 million to $58 million of recurring patent licensing and
        technology solution revenue, including a higher than
        originally expected amount of $8.7 million from Sony Ericsson
        as a result of amounts identified in a routine audit;

    --  $9.3 million of non-recurring revenue related to prior period
        sales of Sony Ericsson's covered 2G products identified in the
        routine audit.

    "We are pleased with our first quarter 2007 revenue performance,"
said Richard Fagan, InterDigital's Chief Financial Officer. "As part
of the management of our licensing business, we conduct routine
periodic audits. With the exception of the additional amounts
identified, our recurring revenue results were largely as expected."

    InterDigital expects overall expenses for first quarter 2007 to
increase by approximately 12% to 15% from fourth quarter 2006, roughly
in line with the company's previous projections. The company
anticipates that patent arbitration and litigation costs for first
quarter 2007 to be slightly below the low end of the previous guidance
range of $6 million to $8 million. Additionally, the company expects
sequential percentage growth in first quarter 2007 expenses excluding
patent arbitration and litigation to be closer to the upper end of a
mid-twenties level, as compared to the mid-teens level previously
projected by the company. As previously projected, much of the
anticipated increase in these expenses was due to increases in
structural costs that reflect an overlap in incentive compensation
plans as well as normal wage inflation and vacation accruals. In
addition, the company's acceleration of planned expenditures
associated with the company's development and fabrication of its dual
mode 2G/3G ASIC (and related PC card reference platform) led to
additional expenses during first quarter 2007.

    William J. Merritt, InterDigital's President and Chief Executive
Officer, noted that the company continues to be encouraged by the
opportunities for its terminal unit ASIC offering. "Based on our
market intelligence, we believe that our terminal unit ASIC offering
will be highly competitive in the data card market with performance
characteristics superior to other products. Accordingly, we signed
important agreements with a foundry and other key suppliers that
accelerated a portion of our product-related initiatives and keep us
on schedule to deliver engineering samples of our 2G/3G ASIC by late
summer 2007. We believe that these investments support our growth
strategy as we work to deliver valuable technology to the market."

    About InterDigital

    InterDigital Communications Corporation designs, develops and
provides advanced wireless technologies and products that drive voice
and data communications. InterDigital is a leading contributor to the
global wireless standards and holds a strong portfolio of patented
technologies which it licenses to manufacturers of 2G, 2.5G, 3G and
802 products worldwide. Additionally, the company offers baseband
product solutions and protocol software for 3G multimode terminals and
converged devices, delivering time-to-market, performance and cost
benefits. For more information, visit the InterDigital website:
www.interdigital.com.

    This press release contains forward-looking statements regarding
our current beliefs, plans, and expectations as to (i) our first
quarter 2007 recurring and non-recurring revenues; (ii) our first
quarter 2007 expenses; (iii) the competitive advantage of our dual
mode 2G/3G ASIC offering; and, (iv) our schedule for the delivery of
engineering samples of our ASIC by late summer 2007. Forward-looking
statements are subject to risks and uncertainties. Actual outcomes
could differ materially from those expressed in or anticipated by such
forward-looking statements due to a variety of factors including, but
not limited to, (i) final reviews of licensee royalty reports and
related matters; (ii) finalization of product development expenses
that should be capitalized or expensed; (iii) unanticipated
obligations to third parties; (iv) changes in technology preferences,
needs, availability, and pricing of competitive technologies and
product offerings; and (v) unanticipated difficulties or delays in the
production and delivery of ASIC engineering samples.

    InterDigital is a registered trademark of InterDigital
Communications Corporation.



    CONTACT: InterDigital Communications Corporation
             Media Contact:
             Jack Indekeu, +1 610-878-7800
             jack.indekeu@interdigital.com
             or
             Investor Contact:
             Janet Point, +1 610-878-7800
             janet.point@interdigital.com