If You Have A Samsung Galaxy S3 i9305 Locked Phone. Then You Can Unlock If Using Your Z3X Tool (If Have!!!).
It's So Easy To Do It...
1st Method (If You Have Not Update Samsung Tool Software),
1st type *#7284# on the phone and select UART->MODEM, USB ->PDA Then tap "Save and Reset"
2nd type *#9090# on the phone and select DM over UART then power off the phone.
Connect the phone to uart RH-45 cable and power on the phone
3rd with Z3X Samsung Tool chose T-989 model and press Unlock button.
Then Your Phone Unlock Done!!!!!!!!!!!!!!
2nd Method (If You Have Latest Z3X Samsung Tool Software)
1st press *#7284# make sure u choose PDA both uart and usb then press Qualcomm USB settings choose DM+MODEM+ADB then press ok wait till drivers install.
2nd use USB cable and run Samsung Tool V13.3 or Any Update, then choose i9305 model and correct Com Port And press unlock
Reading phone info...
Build: M9615ACEHWMAZD1795
Reading security... OK
Calculating... OK
Writing security... OK
Reseting...
Unlock done