For some reason, I can't do nothing when connected to wifi. I can't browse the web or anything. I an connected though with full signal. Internet browsing works perfectly fine on 3G but not on wifi. It was working fine until now. Please help!
If it was working before and you haven't made any changes, just try a hard reset. Hold down the On/Off button on the top of the phone at the same time as the Home button until the phone goes into a reset. You may need to hold the buttons for about 10 seconds.