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#
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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