I have an iPhone 4S and recently updated to iOS 6.0.1 and it won't keep the password or remember the connection to my D-Link Router at my house. What could be the problem with that?
Just to add to this, i would first go to the wifi network on your phone and "forget this network" then do the reboot & re-add your wifi.Reboot both phone and router?! I just upgraded from 5.1 and it works just fine for me right now; didn't have to reenter info...