There are only two ways to get to the internet with any blackberry. 1st is by tdata plan and 2nd is through free wifi. I cant think any possibility that you can get free internet by changing your username..
currently i have a blackberry pearl and iv been wanting to try out the internet feature it has is there any way you change the proxie or the domain name or username or anything so that i can get free internet on my phone any type of sudjestion would be nice