Need Help Setting up Sony Ericsson Xperia X10 on Browsing | Phone/Device Issues and Features | Consumer forum

I have installed SO SIM card on the X10 (previously with Rogers). The phone works. I am having difficulty in getting the Web Browser working. The Wi-Fi shows connected to my home wifi but I can't get the browser to work. (It did work briefly but I don't know what I did but it stopped).

When I click on Browser I get message "Web page not available"

I can't get any real technical support from either SO or Sony Ericsson. I have input as much of the data setting for SO as I can, but I don't really understand what I am inputting so the error (s) maybe obvious to others who are knowledgeable. I have spent hours on this. Any help would be greatly appreciated.