How to transfer number on new sim

LesleyT_2686938  Is it a replacement sim? If so, then when activated it will have your number.

If it is a totally new sim and your number is already on Smarty, then you cannot port between Smarty sims.

If you mean porting your number from another network, read this :

https://help.smarty.co.uk/en/articles/7019273-keeping-your-number