I don't think anyone can give you an unlock code. You have to have the manufacture or a GSM provider, ie T-Mobile unlock it for you. However they may be resistant to doing that, since it's not in their interest.

However, have no fear, do a search on eBay for unlocking cell phones, or on google.com, and you'll find plenty of services that will do it for a fee.

The downside to that is there is no guarantee or warranty that your phone will work after the unlocking process.