<p>The new every two $50-100 credit applies to the primary line only. Secondary lines get discounted phones or $50 credit every two years, so the primary gets $100 credit every two and the secondaries get $50 every two. Depending on the phone selected, a new phone prior to discount could cost from $30 to more than $200. For practical purposes, both the primary and secondary lines should be able to get free phones of some kind every two years.</p>