Sprint early out fees?

[4wheelfurry]

How is early termenation fees calculated?

I added a line (not my mainline) on a Everything Family Data Plan and am about mid way through contract with it and I want to early out on that line. It was my wife's number and her work is now providing her phone through AT&T so it is no longer needed.
I supplied my own phone when I opened the line so there is no phone fee to recoop... Does the price drop as the contract gets closer to its end date?? I figured someone here knows the answer before I call Sprint, I like to deal with them as little as possible..