Call up Sprint International Desk at 817-698-4199 Option 3 and request your unlock code. All they'll do is verify that you are a Sprint Account Holder with a registered Tour and you will get your unlock code at no charge.
(And no, this does not void any type of warranty.)
"How to enter Unlock Code"
1) Shut off Radio
2) OPTIONS / ADVANCED OPTIONS / SIM CARD
3) type MEPD then MEP2 (no caps lock, just made it big so you know what to type.)
4) enter your unlock code
5) battery pull and that's all.