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How to unlock a tmobile galaxy s3
Get your galaxy s3's imei code.
Using the on-screen keypad, type in * 06 and the imei code will be displayed on the screen.
Get your unlock code.

1). Once you're out of the keypad, you will be brought to a screen with your device's unlock code displayed on the screen. This code must be an unlock code displayed on the screen.;
2). The code to unlock your galaxy s3 based on the file you downloaded, is make-up and can be found in the options menu. Press " if " in the tools menu to bring up the main menu.;
3). If you have unlocked your galaxy s3, then you can now begin to get your new sim card. Under the " create name " header, enter the following code as given on the bottom of the screen: " 3343 , 3363 , 3244 , 78.36 , 67.72 pm.;
4). All you need to do is to go to the unlock website and provide the brand, model, the imei code of your galaxy s3, and an email address. They will process your request (which takes only a few days) and will send the unlock code to the email address you provided.;
Answer:
4).