Section 1 - iPhone Hardware:
The iPhones shipping from ATT, Apple have various firmware revisions on them. This also means you do not want to try unlocking without first updating the firmware.
Do Not Try Unlocking without first updating the firmware. People are using tools (iPlus, Ziphone) designed for iPhone firmware 1.1.3 and 1.1.4 on older firmwares such as 1.0.1, 1.0.2, 1.1.1, 1.1.2, etc and then wondering why they are having problems. Do NOT try updating without READING THE DIRECTIONS for the software you are using.
Section 2 - Unlocking Software:
There are two well known unlocking options: iPlus 2.0b and Ziphone 2.6b.
Both of these are designed for firmware version 1.1.4.
iPlus 2.0b — One step solution that will U/J/A ( Unlock Jailbrake Activate ) as well as install the latest version of Installer.app along with a number of useful tools and patches including, but not limited to: BSD Subsystem, OpenSSH, Terminal, Terminal patches, ACF2 support and font relocation (allowing more space for applications). If your iPhone shipped with bootloader 4.6 (Apple) then iPlus 2.0b will downgrade it to 3.9 (FB) which is easily reversible should you ever wish to get your iPhone back to “factory state.”
ZiPhone 2.6b — This will U/J/A and install Installer.app, but that’s it. You’ll need to download and install the other tools and patches yourself. If your iPhone shipped with bootloader 4.6 (Apple) then iiPhone will downgrade it to 3.9 (Apple) which is NOT easily reversible should you ever wish to get your iPhone back to “factory state.”
Between the two, I recommend using iPlus 2.0b because it does a lot more than ZiPhone, while at the same time making it easy to revert to a factory state should you ever need to do so.
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