How to Unlock T-Mobile Galaxy S3 and Use On AT&T and WorldWide!

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I know many of you were asking me this, “can you use T-Mobile Galaxy S3 on AT&T and as a world phone?”

The answer is yes, once you unlock your T-Mobile Galaxy S3, you can simply change its APN settings to use it on any network you want.   I do recommend trying Cellunlocker.net, you can unlock your phone for around $20-25 within an hour or two.

For AT&T, you will get 3G/HSPA+ for data but not 4G LTE since the T-Mobile Galaxy S3 lacks 4G LTE chips.

For using in other international countries like in Europe and Asia, you should also be able to get full 3G/HSPA+.

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8 Responses

  1. Garry says:

    thank you so much max, u made my life so easy, i travel to india a lot.
    now i can take my phone and use it there.
    i asked u once and u were like maybe in future.
    thanks for doing this.

  2. Vijay says:

    You can call 611 and talk to T-Mobile and ask them to unlock your phone since you are going to travel to India and will need to use your phone there.

    Simple, legal and easy solution. I have been doing this for the past 9 years with every phone I ever had in my family.

  3. philips says:

    can I Enable AWS band 3g on the galaxy s3 gt-i9300

  4. anas says:

    How do I root my Fone ..
    All drivers are installed.. But when I Connect with PC it starts charge.. and nothing Happens

  5. Dave says:

    Ok,I got an unlock code from TMO tha doesn’t work. Is it because I rooted my phone? Is there an app that will unlock if I reroot?

    Thanks.

  6. Jose says:

    Max do you have tutorial for unlock the att galaxy s3?

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