You can connect your iPhone with a USB cable to your computer and then you can use the internet. To use the internet you need to enable internet sharing on your iPhone while it is connected to your computer. After that, your computer will register your iPhone as a network and start using the internet.
To use the internet this way, you need to have astrong internet connection, because if you don't have one, you may feel that everything is taking time to process. You should run a speed test https://www.allspeedtest.com[...]
before doing this whole process. I would recommend this tool because that's where you'll, find all the answers to your questions.