There's a wifi network at work that I use that you need a username and password to activate. After my iphone 4 hooks up to the network, a log in screen pops up and I put in my username/password. My problem is, every time my phone goes to sleep, it forgets this info and I have to sign in even if I use the phone just ten minutes later. Does anyone know a way to get my phone to remember this info so I don't have to keep signing in all day long?