If you are already a 48 user then you go through the same process that you went through when joining except using a different email address for your child's account.
Every 48 SIM/number requires its own My48 account which is accessed using a unique email address.
Unlike some other mobile providers 48 don't support group/family accounts where multiple SIMs/accounts can be managed using a single login.
If you use your Recruit and Reward referral link you'll both get rewards.
If you need to contact 48 support about this then see the links in my signature below.
