There are two tcp/ip pipes used by iDEN (actually 3 but 1 is for Voice Mail and Network management).

The one the built in browser uses is free but it only has access to a "walled garden". That is, the browser only links to carrier specified pages. What TekniWap does is take advantage of the 'net alert" system that basically allows links from outside the "walls" to be sent to the phone via enhanced text messages. These links can only be viewed by the phones built in, OpenWave browser. If you tether your tablet to the phone, this is the pipe you use. Now you are outside their walls and you have a larger screen and are using a better browser.

Opera Mini is a Java app and Java apps use an HTTP socks connection through a different pipe. You used to have to pay for this connection to be turned on however, on Boost it now may be provided free of charge. IDK, I use a company provided iDEN phone that has always had everything provisioned. Since I don't pay the bill and I don't use Boost, I don't currently know what the carrier provides for free.