Usually by 6pm on the day the switch was scheduled, @PaulTun_2515351.
Number transfers do happen immediately in the UK - it may take several hours or more to switch the number you want to keep from your old service provider over to SMARTY.
You can check with the support team by chatting online from https://smarty.co.uk/contact.
The advisors work until 8pm, 7-days a week.
