I am sorry about the issues you are having with connecting your PS3 over the wireless connection. Are you able to connect other devices to the 2Wire router? Also, are you able to connect your PS3 to another wireless connection.
A few things worth trying are:
Changing the wireless settings on your 2Wire router and try to connect again. Try changing the SSID (network name) and password.
One other thing as a last resort is to reset your PS3 settings. Here is an article that goes over how to do that.
Hope this helps.
If you encounter any issues with your service or equipment, I recommend checking out our Troubleshoot & Resolve solutions to help diagnose the issue.
*I am an AT&T employee and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.
I am having the same issue with my son's PS3. We tried resetting the router, resetting the PS3 Changing passwords... all of the above. I don't know what to do now. I guess we just have to buy a 100 foot CAT5e and connect it directly from the living room to his room.