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Some Samsung's also need a mastercode as well as the Nuc Unlocking Code.
Also the alternative Networks SIM card needs to be activated.
i.e Working so it connects to it's network to make calls and mobile data etc.
Current Phone > Samsung Note 10+ 5G _256Gb > Model: SM-N976B.
Samsung One Ui 2.1 / Android 10.
Samsung Gear s3 Frontier Watch.
Samsung Galaxy Buds.