My wife used this to upgrade her 5s to the 6 Plus. By the time the 6 Plus came out, she had half the installment plan paid off, and the residual value of the 5s

My wife used this to upgrade her 5s to the 6 Plus. By the time the 6 Plus came out, she had half the installment plan paid off, and the residual value of the 5s (sold to a private party) covered the rest.