Apple iphone 5 unlock sprint?

Hey everyone i recently bought the sprint iphone 5 w/o contract or anything off of ebay, i'm currently in south korea deployed and i thought i could just unlock it and use the service i have here but sprint won't let me do that because i have no account with them, this really sucks because i just spent all this money on an ipod basically. Is there anyway at all to unlock this phone? Verizon and att already come unlocked why is sprint being the pain in my ***?

We actually unlock phones ourself, and the only network that can currently be unlocked is AT&T. We fully expect that to change in the near future, with the service becoming available for most networks, but the market doesn't know when that will be possible.

Feel free to keep tabs on the network you are locked to on the page below:

http://www.mobileunlocked.co.uk/apple/iphone+5/

Simply select your network and if one is available, the page will display the price and average delivery time to unlock it.