A variation of the link posted above worked for me on a Nexus S:
(using this link from your phone will cost you $1.50)

http://wap.t-zones.com/myaccount/hourpasssubscribe.do

resulted in a message confirming the subscription and a working access to the web (at least I was able to do a new search on google).
I do not know yet whether that will work for 1 hour or one day. We will see.