The following is from XenGamers:
While Sega announced plans to release the GameCube version of Phantasy Star Online at their recent GameJam event, players were left with several unanswered questions. In an effort to rectify the situation, Sega released a statement today outlining their plans. Specifically, the trial version of Phantasy Star Online for the GameCube won’t be broadband compatible. According to Sega, this is due to Nintendo’s decision to release the GameCube broadband adapter separately this summer. While the finished version of Phantasy Star Online is expected to be broadband compatible, it’s unknown whether the broadband adapter will be released simultaneously with the game in Japan. More important, online play will be free for the trial version, though possible server fees for the finished version remain undisclosed.
In terms of hardware availability, the GameCube modem and keyboard will be available for purchase separately in Japan. While individual pricing hasn’t been announced, Sega plans to offer bundles including the aforementioned peripherals and Phantasy Star Online.
Source: XenGamers