On behalf of Boingo...

oddgoblin & hans-castorp --to answer your questions:

The per-minute fees are only for the "Boingo Unlimited" plan customers, which is a laptop account for North American usage. The "Boingo Mobile" account provides unlimited access to all hotspots with no premium fees.

Boingo Mobile is currently available for Nokia Internet Tablets, Nokia S60 smartphones, and Windows Mobile 5 devices at this time. Windows Mobile 6 will be available soon.

MORE INFO: http://mobile.boingo.com