I have the iPhone 6s Plus 64 gb, tried to download the iOS 11.1 and it says I'm not longer connected to the internet but it's on?

I have the iPhone 6s Plus 64 gb, tried to download the iOS 11.1 and it says I'm not longer connected to the internet but it's on? - 1

Could be a firmware issue. Turn off the phone and turn it on after 10-15 mins and see if it's showing the same. If it persists, do a factory reset, that should take care of the problem.

Try turning off & putting back on your internet connection