Like Marin said, they have proprietary technologies which allow VoIP on GPRS and EDGE without sacrificing call quality. (Only time will tell if the quality is actually good.) And, like the website and article says, they only run on Windows Mobile now but will soon support BlackBerry, Symbian and jailbroken iPhones. But alas, it does seem too good to be true.
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Like Marin said, they have proprietary technologies which allow VoIP on GPRS and EDGE without sacrificing call quality. (Only time will tell if the quality is actually good.) And, like the website and article says, they only run on Windows Mobile now but will soon support BlackBerry, Symbian and jailbroken iPhones. But alas, it does seem too good to be true.