Sent from my GT-I9100 using xda premium
1. Start the phone WITHOUT SIM card
2. Open the phone application and enter the following code: *#197328640#
3. Then go in the following menus:
Main Menu  UMTS
 Debug Screen
 Phone Control
 Network Lock
Options  Personal SHA256 OFF
On this screen, do nothing. JUST WAIT ABOUT 30 SECONDS.
Then go back by pressing the Menu button (touch left of Home button) then select Back
you are in  Network Lock
then select  NW NV Lock Data INITIALLIZ
On this screen, do nothing. JUST WAIT ABOUT 1 MINUTE.
Then restart the phone.
4. Now your Galaxy i9305 LTE S3 must be unlocked. There is no confirmation message. The way to check is to insert a SIM card from another operator.
Before doing the instructions below, please double check your phone that it is actually LOCKED by inserting a sim card from a different carrier/provider...
you may or may not leave that sim card on the phone while unlocking
Note: your phone must be running at least Jelly Bean 4.1 otherwise some of the menu choices are not present
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