These are instructions on how to downgrade your baseband to 2.28 for iPhone 3Gs with the 5.8 bootloader using Fuzzyband.

This will allow you to unlock your iPhone 3G using YellowSn0w.
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These are instructions on how enable use of Skype over 3G. By default you are only able to use Skype over Wi-Fi.

In order to follow these instructions you must have jailbroken iPhone. You can find instructions on how to jailbreak your iPhone here: Windows, Mac

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These are instructions on how to jailbreak your iPhone 3G on the 3.0 firmware using RedSn0w for Mac. The Windows version of this tutorial is here. The iPhone 2G version of this tutorial is here
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These are instructions on how to jailbreak your iPhone 3G on the 3.0 iPhone firmware using RedSn0w for Windows. The Mac version of this tutorial is here. The 2G version of this tutorial is here
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These are instructions on how to unlock the iPhone 3G for use with any GSM cellphone carrier using UltraSn0w.

Before you can follow these instructions you must have a jailbroken iPhone and you must be on the 04.26.08 baseband(modem firmware). This means that you must be running the 3.0 firmware and have used PwnageTool or RedSn0w to jailbreak.
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