this is 3rd time i've ask this. My iPhone seems to be connected, but safari won't load or open pages

If I got an answer before, I don't know where it went. It wasn't on my email. Now, to my problem...My iPad and my new iMac connect, no problem, to my new AirPort Extreme, but my iPhone doesn't connect completely. It says it's connected but safari screen says it cannot connect because there is no internet connection. Why is this happening when the other two connect with no problem? I've tried everything!!! I've been in to the Apple store twice. First time they reset my phone, and the next time they tested it and foun d nothing wrong. It seemed to connect in their store, but I don't remember if i tried to open any pages.

Does anyone have any ideas?