To use PacketWIN, it is necessary to use "au.net," or subscribe to a provider compatible to PacketWIN.
List of Wi-Fi WALKER WiMAX HWD13, DATA08W, DATA01 compatible providers
This is a list of providers supporting WiMAX-integrated WIN data communication terminals.
List of W05K, W06K, DATA05, DATA06, DATA07, NEX-fi, and au phone compatible providers
Along with "au on net," there are many compatible providers.