Hello. My name is ***** ***** I will be assisting you today.
Can I remotely connect to your computer, so I can troubleshoot this issue with you?
You want the iphone 6s plus to be use as a hotspot via the usb cable?
Please accept offer and I can supply you a remote support link.
It's an additional service, yes. I can help you via chat as well if you'd like.
you can first try going to settings --> general --> reset --> reset network settings
Checking in to see if you still need help with this issue, if so please reply at your convenience.