In this article, i will show you how to unlocking the iPhone 3GS or iPhone 4 on the any baseband that are mention before,and running the latest version iOS 4.3.1...
From the start you have to make sure that your iPhone is comes the baseband versions that mention above.If your iPhone is not set for baseband version then it is not possible to unlocked.
If your iPhone is however running any of those versions, then can easily update to iOS 4.3.1 while preserving your baseband, that will allow to unlocked your iPhone with ultrasnOw.
Step 1: First check that your iPhone is jailbroken update,and then using one of the procedure below.
update to iOS 4.3.1 with PwnageTool, or
update to 4.3.1 while preserving 01.59.00 baseband using TinyUmbrella
Step 2: When you are updated to iOS 4.3.1 then find Cydia, go to Manage > Sources > Edit > Add, and type in the following repo: http://repo666.ultrasn0w.com. This will install the ultrasn0w unlock on your phone.
Step 3: After installing UltraSn0w,then shutdown your iPhone.
Now you can use any different SIM card. When you install T-Mobile, make sure to disable 3G in Settings > General > Network.
Thats all there is to it. The whole jailbreak+unlock process is fairly easy and shouldn’t take more than a few minutes.
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