While littlerock's answer works, there are better options. Specifically, you can do one of the following. The order is what I would recommend:
Change the system setting. This is preferred, as it's using the OS as designed. Do this on the console and provide your password:
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.captive.control Active -boolean false
Prevent OSX from detecting the fact that we're on a captive portal, by editing the hosts file. Apple uses their domain to test whether we are on the Internet or not. To do this, edit the following file as root with a text editor:
/etc/hosts
127.0.0.1 captive.apple.com
Last, you can follow littlerock by renaming the following file (as root) to whatever you like:
/System/Library/CoreServices/Captive Network Assistant.app
If re-setting your network connections didn't help, it could be a hardware problem.
Depending on when it was made, it could be that your WiFi chip inside the phone has pulled (or, rather, is in the process of pulling) off of the circuit board. Late 4S models also had this problem, and here's how it manifests (progressively):
- Very slow speeds / drops connection to the network intermittently
- Stops seeing most (or all) networks, but the WiFi button still works, it's not grayed out
- Can't turn WiFi on at all, the button is grayed out in the settings menu - but the WiFi button in the control center might appear to work.
If your phone is under warranty, then take it to an Apple store and have them replace it. Believe it or not, the repair is quite easy, so if it's out of warranty and you know of a place that fixes phones, they've probably got some spare chips and won't charge too much. Apparently, it's a manufacturing defect, so a repaired phone fixed by someone that knows their stuff could last quite some time.
This has only been a problem with certain 4S and 5 models, you'll see a bunch of people reporting it if you search for something like "iPhone in freezer" - because (believe it or not), putting your phone in a Ziplock and then freezing it for a few minutes has been known to fix the problem for a short time (though I don't recommend doing this).
AFAIK, this isn't an issue with 5C, 5S or recently (as in the last year) manufactured iPhone 5 units. Could be a good opportunity to upgrade, even if you manage to get it fixed.
Best Answer
No.
Entering password to connect to known access points is a one time activity. May I ask, apart from aesthetics, what's your rationale for suppressing the display of the list of discovered networks?
There is no built-in setting to suppress the display of list of discovered, non-hidden Wi-Fi access points in iOS. But ever if it were there, it will only make things hard when you'll wish to connect to a new network (which, varying from person to person can still be a common use case). You'll have to manually enter the SSID and password for the access point.
Also, if it were possible, you won't be able to benefit from the Wi-Fi password sharing feature available since iOS 11 and macOS High Sierra, which lets you quickly join Wi-Fi networks your contacts present nearby are already connected to.