Question: how to connect iphone to mac via usb for internet?
Answer: Step 1: Turn on your iPhone's Personal Hotspot. To do this, open the Settings app and tap Personal Hotspot. ... 
Step 2: Ensure that you have the latest version of iTunes installed on your computer.
Step 3: Connect (or “tether”) your iPhone to you Mac using a USB cable. ... 
Step 4: Now it's time to get you connected!