on 08-12-2020 18:05
on 08-12-2020 18:27
on 08-12-2020 18:27
on 08-12-2020 19:46
on 08-12-2020 19:46
You'll just have to give her the phone as the surprise, then she'll need to get her PAC from giffgaff https://www.giffgaff.com/help/articles/how-do-i-get-a-pac-code-to-leave-giffgaff
Once she has a PAC, she can submit the form here to transfer the number to O2 https://www.o2.co.uk/help/device-and-sim-support/how-to-keep-your-mobile-number