This is very painful, considering that I only have 200 MB of data per month with AT&T. And I have a presentation tomorrow on Evernote in which I'm supposed to use my phone for a demo. If anyone can lead me in the right direction for diagnosing this major problem, it would mean the world to me! This is a Samsung Galaxy S (Captivate). Had it since August 2010. Restarting the phone doesn't do much to fix the WiFi connection. Sometimes when I click the WiFi icon, the text underneath will say "On", but the icon doesn't turn green and the WiFi notification tray icon isn't there either.