Thank you for your suggestions!
Unfortunately, I have a data plan with my carrier and I have all the icons in the screen.
When I go to options => advanced options => browser, the message I see is "default browser configuration".
When I was searching for a answer, I found a post that give really reasons to worry about
: 8707G + O2 (UK) = total disaster - RIM Blackberry Forums - Pinstack.com "O2 confirmed that the lack of a functioning browser on the 8707g was a KNOWN fault and that though it is there on the 8707g, they can't get it to talk to their network. They and RIM are apparently working on it, but at the moment there was NO WAY of getting the browser to work on the 8707g. Gobsmacked. The fix could be days, weeks or months"
If this is true in UK, probably I have the same problem with my carrier in Portugal.
It's my first BB, it seems i great device, but... i'm going to turn back to my Nokia N73.