Wirelessly posted (8700g: BlackBerry8700/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
There is no wireless LAN (wi-fi) capability on the 7290.
To get the native blackberry browser, email, etc you will need a blackberry data plan through your mobile carrier. See http://blackberryfaq.com/index.php/Main_Page
. See the articles there on BIS, and you might also want to look at the article on using a blackberry with a generic data plan.