Primary line talk plan. (so if you have a 69.99 700 min fam plan, primary line costs 60, 2nd 3rd n so forth cost only 9.99.. So 60 will be the principle it discounts from)
Data plans 25$ and up on all lines.
SOME (VERY FEW) company discounts factor in the family msg.. But most do not.
Sent from my GT-N7000 using xda premium