If you want to unlock the HTC Z855 Avid 4 with the IMEI code, we can do this no problem; all mobiles are unlocked by code. After introducing the code the mobile will be unlocked, without losing its warranty or any data. These unlock codes are calculated in minutes, and you will instantly have your phone unlocked forever!
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 MetroPCS or T-Mobile folder.
3.- Choose the Permanent Unlock.
4.- Restart the device.