To use PacketWIN, it is necessary to use "au.net," or subscribe to a provider compatible to PacketWIN.
au.NET (in Japanese only)
"au.net" is a connection service where you can enjoy the mobile Internet immediately without an application. It is very economical because the monthly charge is only billed for the month the service was used.
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.