How to add additional phone to smarty plan

I have a phone that I use a smarty sim that I use for work; I want to add my personal phone to use a smarty sim with.

I added my phone to a group plan, and entered my existing number (that I want to keep) and added my PAC code to keep my existing number.

When I go on the dashboard and go to group plan, it has the additional phone number and Sim, but hasn’t changed to my old number, which I used the PAC code for. When should I expect the phone number to change to my preferred phone number?

Any help would be appreciated!

Many thanks, Duncan