Welcome to Vodafone Community
May I assume the alternative Network Sim Card your putting into the Samsung Galaxy Phone is activated i.e. connects to mobile data etc ?
Sometimes a Samsung phone needs an unfreeze code aka a mastercode as well as the Nuc.
Vodafone Customer Service on 191 or Live Chat can access your account to help and they can also give you the Nuc Department email address @Beckij84
Current Phone > Samsung Note 10+ 5G _256Gb > Model: SM-N976B.
Samsung One Ui / Pie.
Samsung Gear s3 Frontier Watch.