The sms verification is just step one; they’ll likely ask for more later. That said, people have tried burner phones (like https://www.textnow.com/ or https://voice.google.com/) for SMS, but Upwork often blocks VOIP numbers. Using a https://www.expressvpn.com/ + fresh email might help dodge bans, but if they sniff out inconsistencies, your account gets nuked fast. As for free job boards with zero kyc, https://www.craigslist.org/ still works for some cities (just pick a random location), Telegram gig groups, or niche forums.
Most legit platforms crack down hard on anonymity now. If you’re really paranoid, old-school methods like flyers in coffee shops or local bulletin boards (yes, they still exist!) might be your only “no-KYC” bet. Just know: dodging ID checks risks bans, and Upwork’s AI is hungry for fake accounts.