(I'm using wifi from a personal access point in my room, of which the security type is "WPA/WPA2 Personal" (it's what I see in network settings on my mac). Normally it just requires a password to login, no username is required.
My issue is that when I use my iPhone 5 (iOS 7.0.4) to connect to that wifi, it always asks for both username and password. I tried leaving the "username" field blank and fill in the "password" field only, but it says "Unable to connect to...".
This issue happens only on my iPhone and doesn't happen on any other devices such as Macbook, iMac or iPad.