Our company has a couple iphone 4's that can't seem to use the wireless profile. Iphone 3gs and 5 work fine. The 4's are redirected to the user login and can enter credentials, but then nothing happens.
Without a lot more detail (is this a new problem, version of ZoneFlex, WLAN config, etc) - hard to say what's going on. But the iPhone 4 does have some reported issues that may apply: https://discussions.apple.com/thread/...
With limited info and with assumption that Other devices like windows Laptops and smartphone work ok, would like to suggest some steps to narrow down the issue:
1) what is the status of client on ZD when they fill their credentials but nothing happens? If they are authorized then close the window and try a new one to see if it works or not OR when "nothing happens" on the browser just remove the current URL and go to any website.
2) if above step fail then try a different browser on Iphone 4.