so if you want to unlock the phone yourself, you just have to ask your carrier now? just ask and then it's legal to unlock by yourself after the deadline or before the deadline? this sounds like you can't use any unlocked phone (ever) if you dont ask them before this deadline.
wait a minute...you're in the business of repairing phones right?
i would at least expect that you would have answers for this type of questions specially when a customer might ask you to do this for them...