iOS 10 WiFi Upgrades
When you attempt to connect to WiFi on iOS 10 you will see information about that connection.
The most useful is a notice that there is No Internet Connection. This will let you know that the WiFi connection you are trying to use is having a problem connecting to the internet.
There new WiFi options will also show warn you about connecting to unsecured networks.
Tap on the "i" icon for more information including tips to fix your internet connection and make it more secure.