Bought two new 5S's in December with subsidy and extended contract on both for two years on a Family Talk plan. If I switch to a Mobile Share Value Plan now and save $30 a month, what will be my option in October when the iPhone 6 comes out? I know I'll have to purchase unsubsidized or use Next, but will my 5s be unlocked then so i can sell it, or will I have to trade it in to get the Next deal?