on 16-01-2021 15:55
on 16-01-2021 16:10
If you login to your open account you will find an additional code you can hive to her.
Guide: O2 Open & Friends and Family discounts - How to sign up
on 16-01-2021 16:13
on 16-01-2021 16:23
on 16-01-2021 16:23
According to the T&C's you need to apply again for the second discount.
4.3. Scheme Members can apply for a maximum of two Airtime Discounts at any one time, of which only one can be applied against a Qualifying Contract for a phone (“Voice Contract”) and only one can be applied against a Qualifying Contract for a tablet or mobile broadband (“Data Contract”).
https://www.o2.co.uk/termsandconditions/rewards/o2-open