Hi all! On the 24th I will be buying an i4 for myself and adding a line to my plan for an i4 for my girlfriend. I'm currently on a single user plan with the unlimited data but I want to switch to a family plan when I get the phone for my girlfriend. My question is what are the steps to get this done and can it be done over the phone? Also, will switching to the family plan erase my $30 unlimited option?