How to Upgrade, Jailbreak, and Unlock an iPhone 3G
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alexvoda • July 17, 2013 at 7:52pm
I have an iPhone 3G currently running iOS 2.2 with baseband 02.28.00. I need to backup the device, reinstall the OS, jailbreak it, unlock it for use with other carriers, and configure it for tethering with a Windows laptop. What are the best steps to achieve this?
Answers
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iClarified • January 14, 2026 at 3:14am
To upgrade, jailbreak, and unlock your iPhone 3G, follow these steps. First, ensure you have the latest version of iTunes installed on your computer and perform a full backup of your device. The final supported firmware for the iPhone 3G is iOS 4.2.1. You can update to this version via iTunes, but be aware that updating normally may update your baseband, which could affect your ability to unlock. Since you are on baseband 02.28.00, you are in a good position to unlock using ultrasn0w. Use Redsn0w to jailbreak your device on iOS 4.2.1. During the process, Redsn0w will provide options to install Cydia. Once jailbroken, open Cydia and search for ultrasn0w to perform the carrier unlock. For tethering, you can install apps like MyWi from the Cydia Store or look for tethering enablement hacks specifically for iOS 4.2.1. Always ensure you have a stable connection and sufficient battery before starting the jailbreak process.