This entire site is a “responsive” design. That’s how the view can change when you rotate from portrait to landscape.
As for the phone vs computer tangential discussion here, I’ll leave you with this. A phone for casual use of the web is fine. If all you are going to do is browse the web, get your email, use Faceplant or some other social media site, a phone is fine.
However, for more serious work, such as designing circuit boards, retouching images, manipulating a lot of data on a large spreadsheet, updating a web site, or any other work that demands a larger screen and more processing horsepower, then a phone simply is not going to work.
A couple of you have mentioned turning on your computer to browse the web or use this forum. My three computers (personal PC, OGR PC, and a MAC for video editing) have been turned on 24/7 for years! I never turn them off. Solid state devices most often fail upon start-up. They don’t gradually wear out like old tube-type stuff did. So I leave them on all the time.