No argument here. I was researching something similar earlier. You need a plan for both phones. You should be able to activate the second phone on the same account but either way it's still a 2 year commitment.
You can cancel the line for the second phone but you Have to pay the early termination fee. The early termination fee for a smartphone on a 2 year plan is $350. There is no way around this. Sorry. I was thinking about the same thing over a year ago.