MetroPCS T399N 4.4.2 unlocked..Just unlocked it selecting T399 model.

Just unlocked it selecting T399 model.

Code:

Selected model: T399
Selected port: COM12 Z3X BOX Serial Port
Selected port speed: 115200
Waiting ADB device... OK
Reading phone info...
Model: SGH-T399N
Android version: 4.4.2
Product code: SGH2T399RNATMB
Phone version: T399NUVUANH1
PDA version: T399NUVUANH1
CSC version: T399NTMBANH1
IMEI: 35xxxxxxxxx
Phone S/N: RV8F90EH0NZ
Checking Super user right... true
Reading nv data... OK
Checking magic... OK
Detected new type of security
Calculating... OK
Unlocking... OK
Rebooting phone... OK
Unlock done
Done with Samsung Tool v.18.2