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Re:Facebook: Another three billion fake profiles culled by 333c on Saturday May 25, 2019 @11:05AM (#20009434)
Firefox has a mode where you can choose from a dropdown of phone/tablet types, and it will set your user agent and screen size appropriately. I believe it's called "Responsive Design Mode."
Re:Facebook: Another three billion fake profiles culled by jobigoud on Saturday May 25, 2019 @12:18PM (#20009797)
That worked, thanks.

Dev tools > Responsive Design Mode in the top right, then back on the main page, selected a phone model. I had to reload the page for it to show the phone version of the site.