I use wifi on my 3GS alot. Mostly at home and on campus at college. Everything was fine. I used wifi both places in os 3.1.2. I upgraded to ios4 and I can still connect to wifi fine at home but at school it says in settings that it is connected to the campus network but the wifi symbol on the status bar doesn't show up and I still get only edge even though I am supposedly connected to wifi. And my girlfriends 2G running 3.1 is just fine so it's not the networks fault. What could be wrong?