janetihill ...Welcome to giffgaff and the community
• SIM activation's are completed within 30 minutes, however during periods it can take up to 24 hours for the activation to complete.
Emails tend to get sent out early , In the mean time you can reboot your phone by turning it off and on, hopefully it should work
• You can check if your SIM has been activated by logging in here ⬇️
• You will notice the completion of the SIM when you see any active allowances e.g goodybag/ airtime credit along with your New Number
I hope this helps👍🏻