Has anyone had any problems using their iPhone with the AT&T WiFi at Starbucks? I am using it through the rewards program where you get free WiFi if you use a Starbucks card to buy your coffee. About half the time, I can't seem to get connected. It actually shows I'm connected to AT&T WiFi, but when I go into Safari, it tries to pull up the AT&T login screen but never makes it. The little progress bar stops at about 25% and never goes any further. Like I said this happens about half the time. Has anyone else experienced this. I have no problems at all using my iPhone with the WiFi at my home. Maybe I need to try a different Starbucks.