Does it really need to be a cell phone number if your specific need does not mention SMS messaging? If not then Vonage has always been a nice landline service. Bring their router box and plug into your argentina home internet. I did for many years, until my phone requirements lessened. I kept one box in US and one here in Argentina for each of my home offices, by disabling/enabling each one depending on where I was.
Google Voice has a business service you can pay for. I have worked full time, full days on phone calls, dealing with the occasional conference call that gets disconnected at the 3hr limit, requiring me to redial. No sim, just internet based service
I have had the same Google Fi phone number with cell service for 10+ years. Billed to US address. Most of the time paused, without any charges, but when I really need to take a cell call, while away from the home office, or receive sms, I unpause and pay the $0.028 per hour charge ($20 ÷ 30 days ÷ 24 hours). Get a subsidized Pixel or Samsung phone with 24 months of payments or same cost in one payment, coinciding with a US visit, requiring me to pay the full unpaused $20 per month service for 3-4 months to qualify.