Just recently purchased a Samsung Galaxy S 4G and I can't seem to get data to work on it using AT&T. There's a "3G" icon in the notification bar and I'm able to send/receive picture messages, but there seems to be no connection when trying to use the browser, Market, and other apps that use data. I've tried several combinations as far as APN settings go, but no use. I thought at first maybe there was a block put on my data connection ($50 Unlimited Plan on AT&T), but I can use data on my old phone, an LG DoublePlay (another unlocked T-Mobile smartphone) without any problems. I realize that the Galaxy S 4G is a smartphone, but it's listed as one that would work with unlimited data. Any help would be much appreciated!