what is the easiest way to do both of those
If the phone is active on your account, call Sprint and ask them to Unlock it. The do it as long as your account is not over due, and been a customer for 90 days or so.
(Tell them you need it for international use)
You could sell it on eBay internationally, whatever you do, make sure to use tracking and insurance. I would suggest only offer USPS Express