Cannot get 2wire to work on my iphone! :(

IPhone and AT&T 2wire internet connection I cannot get my IPhone and AT&T 2wire to get an Internet connection. My IPhone shows that I have wireless connection, but whenever I try to go to a web site, or check my email, Utube, etc, it says I do not have an Internet connection! When I'm outside of my "2wire router", I have NO problem picking up and connecting to any other wireless connection. Has anyone else had this problem, and how can I fix it? It is frustrating especially because the IPhone is AT&T, and so is my router!!! FYI - I have no problem with my My laptop connecting to the 2wire, wireless connection. ~Signal strength is "Excellent"!!!
It was suggested that I download the IPhone applications, (which I did) but I could only get so far... I get an "ACTIVATION ALERT" that says, "No signal detected. Signal is required to complete activation." (I have NO cell signal where I live) I finally drove to where I have signal, and "completed the activation", however, when I got back home, rebooted the 2wire router, AND my IPhone, (including putting in my 2wire password, etc.) I am having the same issue. (Showing FULL signal, but NO INTERNET connection on my IPhone).
ANY IDEAS!??????