I have an iPhone. The iPhones have a SIM card in a slot on the side. I was told that all iPhones are unlocked. At least on Verizon.
More than one travel cell type service told me that and instead of renting a separate phone for my trip, I just rented a SIM card.
Worked very well. Even got an US number as well. I forwarded my regular US number to that number and people from the U.S. We’re able to just dip my regular number to reach me.