Can’t connect to public wifi

Perhaps you've found the workable settings to connect to internet

by Cellular in your iPhone. There'is this article, seems to cover that..

• Use cellular data on your iPhone or iPad - Apple Support

//support.apple.com/en-us/HT201299

You may toggle this 'on and off'. Be aware when it's 'on' your Data

on a mobile account often costs more; and goes away sooner, than

if you've a steady wi-fi base, or other boosted non-cellular access.

When away from a wi-fi source, you can ration this; & your battery too.

And if your cellular account is on pre-pay, you may have to add time.

My home internet uses wired ISP modem; to wi-fi base. Yet iPhone at

sometimes needs to use cellular; so those settings need checked, too.

Also there are time where you may use 4G wi-fi to update your iOS.

Works, surprisingly, on some older iPhone models; just 2 weeks ago.

(As my cell phone was 'added as pre-pay,' when away from town, I

can run out; but found the provider's number works after depleted.)

What happens when you try?

If you want help, then you need to describe what is happening, what are you trying, what error messages you see, etc. Please provide as much detail as you can.

When you are not near your home Wi-Fi your only reliable option is to use cellular data from your carrier. So if you don’t have cellular data on your phone contact your carrier to have it added.