Press Release

December 6, 2007

Centennial offers BlackBerry 8703e and BlackBerry 8830 World Edition Smartphones with Wireless Broadband Service and GPS Navigation

San Juan, Puerto Rico - Centennial de Puerto Rico (Nasdaq: CYCL), a leading telecommunications provider in Puerto Rico, and Research In Motion (RIM) (Nasdaq: RIMM; TSX: RIM), a global leader in wireless innovation, today announced that the BlackBerry® 8703e and BlackBerry® 8830 World Edition smartphones are now available to Centennial customers.

 “The addition of the BlackBerry 8703e and BlackBerry 8830 World Edition smartphones to Centennial’s portfolio increases our ability to support our customer’s business and personal needs, keeping them ahead of the game with state of the art technology,” said Alvaro Pilar, Senior Vice President and General Manager for Centennial Business Solutions. “This is yet another confirmation of our commitment to keep ourselves at the forefront of the telecommunications industry, making it easier for our clients to stay connected anywhere and at all times by taking full advantage of our superior network.”

Both the BlackBerry 8703e and the BlackBerry 8830 World Edition support phone, e-mail, messaging, organizer, browser, GPS and other mobile applications, and are compatible with Centennial’s EV-DO network to deliver broadband wireless access. The smartphones feature large, bright, high-resolution color LCD displays that provide ample workspace for viewing e-mail, web pages, and other applications. Intelligent light sensing technology automatically optimizes screen lighting levels for viewing in outdoor, indoor and dark environments. Each handset comes equipped with a full QWERTY keyboard that enables rapid, efficient and accurate message typing and information entry on the go.

The BlackBerry 8703e and BlackBerry 8830 also offer premium phone features in a design that provides a natural feel while dialing. Placing calls with one hand is fast and simple and the handsets include large, dedicated “send,” “end,” and “mute” phone keys. The handsets also feature intuitive call management tools, such as smart dialing, conference calling, speed dialing and call forwarding. Both smartphones also come with a built-in speakerphone, support for polyphonic and MP3 ringtones and integrated Bluetooth wireless technology.

The BlackBerry 8703e and BlackBerry 8830 World Edition smartphones also include built-in GPS to support location-based applications and services. Customers can also use BlackBerry® Maps to provide step-by-step driving directions.

The stylish BlackBerry 8830 World Edition goes a step further. It is the first CDMA-based BlackBerry smartphone capable of roaming on GSM/GPRS networks, so customers can travel internationally with full mobile voice and data features. It also includes a media player for music and videos, an expandable memory slot and a high-capacity battery.

“These two BlackBerry models give us the opportunity to continue offering products that help our customers reach their goals.  In our industry it is extremely important to provide business solutions that fulfill the needs of our clients and allow them to optimize the productivity of their business,” said Carlos Blanco, President of Centennial Puerto Rico. 

 “BlackBerry smartphones are a great fit for mobile professionals who demand superior e-mail, web browsing and voice performance in a stylish and lightweight handset design," said Mark Guibert, Vice President, Corporate Marketing at Research In Motion. "We are pleased to be working with Centennial to bring these smartphones with built-in GPS and EV-DO support to customers in Puerto Rico”.  The BlackBerry 8703e is available from Centennial for $149.99 and the BlackBerry 8830 World Edition is available from Centennial for $249.99. These prices are available to new customers on two-year service agreements as well as to existing eligible customers on qualifying rate plans. For information on how to get yours, contact Centennial at 787-717-9700 for corporate accounts, 787-717-9595 for personal accounts, or visit Centennial’s webpage at www.centennialpr.com.

About Centennial
Centennial Communications (NASDAQ:CYCL), based in Wall, NJ, is a leading provider of regional wireless and integrated communications services in the United States and Puerto Rico with over 1.1 million wireless subscribers and 419,500 access lines and equivalents.  The U.S. business owns and operates wireless networks in the Midwest and Southeast covering parts of six states.  Centennial’s Puerto Rico business owns and operates wireless networks in Puerto Rico and the U.S. Virgin Islands and provides facilities-based integrated voice, data and Internet solutions.  Welsh, Carson, Anderson & Stowe is a significant shareholder of Centennial.  For more information regarding Centennial, please visit our websites http://www.centennialwireless.com/ and http://www.centennialpr.com/.

About Research In Motion (RIM)
Research In Motion is a leading designer, manufacturer and marketer of innovative wireless solutions for the worldwide mobile communications market. Through the development of integrated hardware, software and services that support multiple wireless network standards, RIM provides platforms and solutions for seamless access to time-sensitive information including email, phone, SMS messaging, Internet and intranet-based applications. RIM technology also enables a broad array of third party developers and manufacturers to enhance their products and services with wireless connectivity to data. RIM’s portfolio of award-winning products, services and embedded technologies are used by thousands of organizations around the world and include the BlackBerry® wireless platform, software development tools, radio-modems and software/hardware licensing agreements. Founded in 1984 and based in Waterloo, Ontario, RIM operates offices in North America, Europe and Asia Pacific. RIM is listed on the Nasdaq Stock Market (Nasdaq: RIMM) and the Toronto Stock Exchange (TSX: RIM). For more information, visit: www.blackberry.com or www.rim.com.

Forward-looking statements in this news release are made pursuant to the "safe harbor" provisions of the United States Private Securities Litigation Reform Act of 1995. When used herein, words such as "intend" and similar expressions are intended to identify forward-looking statements. Forward-looking statements are based on assumptions made by and information available to Research In Motion Limited. Investors are cautioned that such forward-looking statements involve risks and uncertainties. Important factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements include, without limitation, possible product defects and product liability, risks related to international sales and potential foreign currency exchange fluctuations, the initiation or outcome of litigation, acts or potential acts of terrorism, international conflicts, significant fluctuations of quarterly operating results, changes in Canadian and foreign laws and regulations, continued acceptance of RIM's products, increased levels of competition, technological changes and the successful development of new products, dependence on third-party networks to provide services, dependence on intellectual property rights, and other risks and factors detailed from time to time in RIM's periodic reports filed with the United States Securities and Exchange Commission, and other regulatory authorities. RIM has no intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

The BlackBerry and RIM families of related marks, images and symbols are the exclusive properties and trademarks of Research In Motion Limited. RIM, Research In Motion and BlackBerry are registered with the U.S. Patent and Trademark Office and may be pending or registered in other countries. All other brands, product names, company names, trademarks and service marks are the properties of their respective owners. RIM assumes no liability and makes no representation, warranty or guarantee in relation to third party products or services.