U1, will work with all prepaid providers in the USA as well as long as they support the model.
Samsung Galaxy S23 Ultra S918U1 5G Factory Unlocked - Good
Samsung Galaxy S23 Ultra 5G S918U 512GB Unlocked - Good
Samsung Galaxy S23 Ultra 5G S918U 256GB Unlocked - Good
Samsung Galaxy S23 Ultra Phantom Black 256GB Unlocked - Good w/ Replacement Back
Samsung Galaxy S23 Ultra 5G - 256GB Green *UNLOCKED* [SM-S918U] Very Good
Samsung Galaxy S23 Ultra 5G - 512GB Green *UNLOCKED* [SM-S918U] Very Good Refurb
![Samsung Galaxy S23 Ultra 5G - 256GB Green *UNLOCKED* [SM-S918U] Very Good](/images/thumb.php?i=24121789&s=195)
![Samsung Galaxy S23 Ultra 5G - 512GB Green *UNLOCKED* [SM-S918U] Very Good Refurb](/images/thumb.php?i=50474244&s=195)