Welcome to Vodafone Community
If.you have already received your Nuc then use an active alternative non Vodafone UK sim card i.e. connects to mobile data etc and it'll invoke a pop up box to input the code into.
Further help and advice in > How-do-I-use-my-nuc
If you haven't applied for the Nuc then follow > Vodafone and unlocking-your-phone _ Nuc Request help.
Current Phone > Samsung Note 9 _512Gb > Model: SM-N960 Hybrid-Duos.
Samsung One Ui / Pie.
Samsung Gear s3 Frontier Watch.