Or a Walmart. Years ago, before Google Voice, I got one because I needed a local area code number for my apartment's buzzer. Mainly to see that if I could do it, I did things as anonymously as possible: bought a Tracphone at Walmart with cash. Turns out you needed an existing phone number to activate it, so I used the payphone that was outside a nearby gas station.
Used that method as my primary cell phone contract for many years.
I haven't looked into it recently, but it must be easy. Many games have SMS verification for accounts, and it seems that every person that streams those games has like 10 accounts.
With the amount of facial recognition going on at large stores....probably a good bet. I'm not so concerned with the privacy as the ability to cancel without repeated 30 minute phonecalls to customer service.