Buying the SIM FREE version from Apple should work with any carrier.
Apple provides the following information for when purchasing phones directly from a carrier.
If your account meets requirements, the carrier can unlock certain models of iPhone so that they can work internationally. These models are still restricted to that carrier in the United States and won't work on any other U.S. carriers. Contact your carrier for more details.
Will an unlocked Verizon or ATT iPhone XS work on any carrier?
Apple provides the following information for when purchasing phones directly from a carrier.
If your account meets requirements, the carrier can unlock certain models of iPhone so that they can work internationally. These models are still restricted to that carrier in the United States and won't work on any other U.S. carriers. Contact your carrier for more details.
Will an unlocked Verizon or ATT iPhone XS work on any carrier?
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