Unlock Samsung galaxy s4

I get a galaxy s4 who was use with metropcs. Now I wanted use it with T-Mobile but I need to unlock it. I found few site do this but they are charging 30-35 $ for this. My question is they is a way to do this with out paying. Thanks for the help.
Answer #1
Try xda developers for free unlocking or eBay for a cheap code.
Answer #2
Thanks I will try with xda developers.