When your device is lock with the metropcs/t-mobile device unlock you can get your device unlock for free if it "eligible for unlock" you just have to process like i gonna show you:
1-connect your lock android smartphone to wi fi nearby
2-Make sure you internet connexion is good working
3-go to your phone and search for " Device unlock " in app
4- launch it ,if it ask for autorisation click allow
5- click on permanently unlock
6- Visite my website for more by copying and paste this link in your browser zipansion.com/2WzVx