How to access the internet through wifi without a data plan on the blackberry curve 8900?

I have a Blackberry Curve 8900 (the new). I have no data plan, but I keep hearing that you can access the browser while connected to Wi-Fi. But every time I try to access the Internet via the phone, keeps saying I need a data plan to access the Internet. If someone told me how to solve the problem, I would be happy.

Can I use the command line mysql interface for windows with my yahoo small business plan?

I want to create and edit my databases MySQL command line and phpMyAdmin. Is this possible?

How can i get internet on my phone through wifi without a set internet plan?

I have an HTC S621 Dash and I do not wifi.Est free Internet telephone is possible that I can connect to my router at home via wifi on the phone and surf the web without having to pay anything?

Are there any phones out there that allow wifi access WITHOUT forcing you to buy a data plan?

In other words, I want to be able to use wifi when available, but not pay for data access in mobile cellular lines where there is wifi available. Thanks!