I did a quick search, but I could not find a problem similar to the one I'm currently experiencing.
Long story short, I ended up with another blackberry via work. I gave one (Bold 9700) to my wife so she could use. She does not have a data plan ( don't ask), but would like to use the wifi feature. Before she put her sim card in, she set up wifi and it was working. After she put in her sim card, it will not allow her to use the browser.
Also, any reason why she would not be able to send MMS text now?
not sure about mms but the browser requires connection to the rim servers which I believe you need to have a data plan in order to get the proxy of the rim servers