1. - Make sure you have an active data connection via 3G/4G/LTE or Wi-Fi.
2.- From the Application list, tap Device Unlock, the application is located in the T-Mobile folder.
3.- Choose the Permanent Unlock.
4.- Restart the device.
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"100% recomendado, cumplieron como lo prometieron..."
"Thanks! my phone was unlocked in two hours"