Can anyone tell me how to unlock a Windows Phone handset for cheap, preferably free?
check out these you may unlock it
I would have suggested you to use the cheap service of ChevronWP7 but unfortunately they are officially discontinued. I am afraid the only option you have is to register your Windows Phone as a developer device with your Windows Live account for the cost of $99. If you're willing to pay for that go to http://create.msdn.com/en-US and follow instructions after sign in with your Windows Live account.
Hopefully one day some genius out there will start jailbreaking Windows Phone ;-) Good luck
try this link.....
I have no Windows Phone with me, but i think it is not as famous as iPhone yet, and i think there will be no people trying to unlock it yet.. At least for now.