Ok 1U means the devices isn't factory unlocked its a carrier model that the reseller on Amazon listed as Unlocked which isn't the case Unlocked Models are U1 so your S23 model is SM-S911U a true Factory unlocked would be SM-S911U1. I would suggest returning the device if its still within the return window.
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You could try to contact the carrier that its locked to and ask them if they will carrier unlock it to work on other carriers
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I would suggest taking it to a metro store and see what they say if they cant resolve the issue I would take it to a certified repair center to have it checked.
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Samsung offers a variety of repair locations, including walk-in Samsung service centers. Select the product that needs service to find a location near you.
