Help with preorder on family plan

[carmello51]

I'm trying to pre order my mom the new phone, but when I give Apple the account details, there's no option to select which line I want to upgrade. I tried entering my mom's number into the account details during the pre order process, but I always get the same error. Can anyone help?

 

[carmello51]

anyone? i have no idea how to go about it and I thought someone here would.