Actually that is a CDMA phone. So it does not use a sim card so it can not be unlocked. Only gsm phones like at&t & tmobile. Only some newer smartphone cdma phones can be unlocked as long as they use a sim card. (4G LTE Phones only).
that is info to me. I dont really know anything about this stuff. I looked up how to unlock this model phone. I figured it wouldn't be an issue. I sold my other metroPCS phone like this and i havent gotten a complaint from the buyer.