Let me confess to being brand new to the iPhone 4 that I just bought. Last week, when I was in a hotel, I was able to connect to WiFi with no problem. When the screen on the iPhone went blank and I had to slide to slider to unlock the phone, I had to log into the Columbris interface. (When you log in as a guest on the WiFi network, you have to authenticate again on the Columbris page.) Obviously having to log in each time makes the WiFi connection useless. When I returned to work, I experienced the same problem, also with Columbris. Is there a way to keep the connection alive to that I don't have to log in each time I want to check my email?