Dobson Communications Corporation is a provider of rural and suburban wireless communications services in the United States. The Company provides its services in portions of Alaska, Arizona, Illinois, Kentucky, Kansas, Maryland, Michigan, Minnesota, Missouri, New York, Ohio, Oklahoma, Pennsylvania, Texas, West Virginia and Wisconsin. It offers digital voice and feature services to all of its covered population through its Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS) and Time Division Multiple Access (TDMA) digital network. In 2004, it deployed GSM/GPRS and Enhanced Data for GSM Evolution (EDGE) digital technology on its network, which enables Dobson Communications to offer enhanced wireless data services. The Company's operations are encompassed in its two wholly owned subsidiaries: American Cellular and Dobson Cellular. The Company generates operating revenue from service revenue associated with its wireless services to its subscribers; roaming revenue from subscribers of other providers, and equipment and other revenue from selling wireless equipment. In March 2005, the Company announced an agreement to sell and leaseback 563 of its cellular towers with GTP. The transaction is expected to close sometime later in 2005. Wireless Services Dobson Communications derives service revenue by providing wireless services to its subscribers. The Company offers digital service using both the GSM/GPRS/EDGE digital standard and the TDMA digital standard in all of its wireless markets. In addition, Dobson Communications offers various custom-calling features, including voice mail, call forwarding, call waiting, three-way calling, no answer transfer, caller identification (ID), message waiting indicator, sleep mode for longer battery life, voice-activated dialing, and mobile originated and mobile terminated short message service. The deployment of GSM/GPRS/EDGE technology allows the Company to provide more advanced wireless data services, thereby giving its subscribers the ability to access the Internet, to send and receive pictures and video, and to download games and music. Dobson Communications offers wireless service under the CELLULARONE trademark in all of its markets other than western Oklahoma and the Texas Panhandle, where the Company uses and owns the service mark DOBSON CELLULAR SYSTEMS. The Company offers its subscribers various rate plans intended to meet a particular subscriber's expected calling needs. Its offerings include national rate plans, which use Dobson Communications's networks, and those of other third party providers, mainly Cingular Wireless and AT&T Wireless, and regional and local rate plans at a variety of pricing tiers. The Company's rate plans generally combine a fixed monthly access charge, a designated number of minutes-of-use, per minute usage charges for minutes in excess of the included amount and additional charges for certain custom-calling features. Most of its plans include some features, such as voice mail, caller ID, call forwarding and call waiting. Roaming Dobson Communications derives roaming revenue by providing service to subscribers of other wireless providers when those subscribers "roam" into the Company's markets and use its systems to carry their calls. Accordingly, where possible, the Company attempts to arrange roaming agreements that allow customers to roam at competitive prices. Dobson Communications operates many systems that are adjacent to certain metropolitan areas and include expressway corridors. Dobson Communications's two most significant roaming partners are Cingular Wireless and AT&T Wireless, which accounted for over 91% of its roaming traffic and 84% of its roaming revenue in 2004, respectively. The Company has entered into long-term roaming agreements with both Cingular Wireless and AT&T Wireless to provide their subscribers with GSM/GPRS/EDGE and TDMA services when they roam in its markets. These agreements also allow Dobson Communications's subscribers to roam outside of its service