MetroPCS is under T-Mobile's network so it should work. I'm using a verizon Lg G2 on T-Mobile and it works fine. You just have to root it and load a custom rom like CM or anything like it. The stock rom of the verizon G2 won't recognize a T-Mobile sim card so that's why you have to load a custom rom.
Try choosing the T-Mobile variant. That's what I did to get simple mobile Sim card to work, but do not do it if your scared it's going brick your phone. I don't have the vs980 I have the ls980 and it worked.
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