T-Mo ONE doesn't have any taxes & fees - what u see is what u pay. So after $20 credit if he uses less than 2gb on each line he gets another $20 credit thereby lowering the price of 2 lines to $0.
Exactly.
How much is the plan(each line) per month?
As you bolded in your earlier quote he's paying $20 per line. Idk if that's because he's adding onto a bigger acct or because that's the standard.
Well, T-Mobile has been wonderful in offering free lines of service every few months (amongst the other wonderful things they keep doing).
So, my current plan is T-Mobile One (Unlimited everything) @ $120 for 2 lines + 2 additional lines at $20 each + 2 lines @ $0 each + 2 lines @ $10 each (with option to make these $0 each after Kickback).
Total is 8 lines for $160-$180 (or $20-$22.5 each).