How to unlock a samsung s3
I assume you mean carrier unlock (allowing the use of SIM cards from other carriers and using the phone with different networks).
If the carrier is AT&T, if you get on their online tech support chat on their website and ask for an unlock code, they will usually give you one. Just enter it when you insert a SIM card from another network and you'll be good to go.
If it's not AT&T, it's doable but a bit more involved.
Your phone must be running the latest version of it's stock, UNROOTED ROM without any custom recovery/boot loader installed. Evethghing must be totally stock, and updated to android 4.1.1 or later. Once that correctly describes the state of your S3, proceed as follows:
Make sure you have a SIM card from the original carrier inserted and at least 1 bar of reception. it doesn't need to be one with active service - expired is fine. All cell phones, by federal law, allow dialing of 911 even if they have no active cellular service being paid for. So a reduced connection is still obtained even with an expired SIM.
Dial the following keys *#197328640#
 Debug Screen
 Phone Control
 Network Lock
Options Perso SHA256 OFF
(after choosing this option, wait about 30 seconds, then go back one step by pressing the Menu button then select Back, now you are in
 Network Lock
 NW Lock NV Data INITIALLIZ .....
wait for a minute then reboot your phone
It should now be unlocked, but you won't be able to tell without inserting a SIM from a different carrier. If you do, it should work without any issue.
This might work without any sim card inserted, or a different one, or might not. If you don't have the original, just try and see.
Mar 06, 2015 |
Samsung Cell Phones