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How to Unlock Samsung Galaxy S III? Free SIM Unlock

Updated on August 29, 2012

Now you can unlock your Samsung Galaxy S3 GT-I9300. After unlocking it you can use any SIM card without restrictions. A locked SGS3 can get freedom in this way from the limitations on it by the carrier companies. All these can be done for free!!!

You may think : is it really free? Is there any hidden cost. But no, I am assuring you that there are no hidden costs or any prank. You can unlock SGS3 for free.


1) You need a Samsung Galaxy SII GT-I9300 mobile. Other versions of SGS3 probably will not be unlocked by this process.

2) The phone must be rooted. Rooting is necessary to access the system area of the phone where the network lock keys can be found.

3) Backup all your important phone data before proceeding.


This app is not that powerful to damage your phone. But an accident is an accident. If the Samsung Galaxy S III is damaged by any way while unlocking the author will not take any responsibility for it. There is no warranty or official support system.


Unlocking SGS3

The unlocking of Galaxy S3 can be done using an Android app.

1) Go to Google Play Store and search “Voodoo Galaxy S III SIM Unlock” or click here.

2) If you have downloaded the app on your PC then connect your Samsung Galaxy S III to PC. Then transfer the apk file to your mobile.

3) Now install the app on your device.

4) Press the “Query SIM lock as seen from system” to know your phone locking status.

5) You can see a yellow message on it,“ SIM lock: active”.

6) Press the “Unlock” button.

7) It would unlock your phone. No need to reboot.

8) Now press the “Query SIM…” button again to check that the unlocking process was successful or not.

9) If it is successful then it will show the message: “SIM lock: inactive”.


You shall face the following problems:

1) Only GT-I9300 model of Samsung Galaxy S3 can be unlocked using this app. Other models will not get success in unlocking.

2) If your mobile is not rooted this and so unfortunately, updating it will be failed for sure.

3) The “query SIM lock….” Button often needs to press twice.


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    • profile image

      DDDD 5 years ago

      don't work on SGH-T999 ) :

    • profile image

      Sandesh 5 years ago

      Does anybody know how to unlock Galaxy S 3 I747 for ATT.


    • profile image

      sandesh 5 years ago

      Will it work for Samsung Samsung Galaxy S 3 I747 ?

      Can I still use AT&T which is my current provider?


    • pinappu profile image

      pinappu 5 years ago from India

      Hey alung12, thank you for stopping by and dropping a comment.

    • alung12 profile image

      alung12 5 years ago

      I love this hub, thank for the info.

    • pinappu profile image

      pinappu 5 years ago from India

      I am glad to here it SGS. Thank you for let us know.

    • profile image

      SGS 5 years ago

      Thank you very much pinappu. This is really helpful. I have unlocked my Samsung Galaxy S3

    • pinappu profile image

      pinappu 5 years ago from India

      Yes, smartmusic , than you a lot for dropping a comment.

    • smartmusic profile image

      smartmusic 5 years ago

      Hey! This is something I will definitely be checking out, thanks!