http://www.worldgsmcodes.com/lg-electronics/LG-K7-network-unlock/
1-Make sure you have an active data connection via 3G/4G/LTE or Wi-Fi.
2-From the Application list, tap Device Unlock. (Note: The application may be located in the MetroPCS folder.)
Tap Continue.
3-Choose the Permanent Unlock type:
4-If successful, restart the device to apply the settings.
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