I have a jailbroken iPhone 3g version 3.1.2(7d11)

Apple fans have been waiting for a newJailbreak and a Carrier Unlock for the new iOS 4.2.1, and the iPhone Dev Teamhas released the goods. It may not be simple, but at least a solution isavailable. One of the most fortunate thing was that the newer upgradedid not update the baseband, and so the baseband remained at 05.13.04. So u<b><span>nlock and jailbreak foriPhone 4, 3G and 3Gs</b>becamemuch more easier, however the good thing is that iPhone 4,3G,3Gs can beunlocked and jailbroken on the iOS 4.0.2/4.1 or 3.1.3 at the moment, becausethe current jailbreaking & unlocking tools are compatible with iOS4.0.2/4.1 or 3.1.3. Unlocking Ltd. has introduced a fresh iPhone unlocksoftware that will allow users to explore their Apple iPhone's customizationand application capabilities. Specifically, it can "unlock and jailbreak iPhone4.2.1, 3G 3Gs and iPhone 4 4.2.1."</span> The veryfirst unlocking software for iPhone was unlocked by iPhone Unlocking Ltd inJuly 2007. More than one million customers from more than 145 countries havedownloaded the software. Additional features are added to a mobile phone, thanksto jailbreaking and unlocking has become a trend among iPhone users. Users canalready explore the various functions of their iPhones once it has beenunlocked and jailbroken. If we are mac users, we can put dvd to iphone 4 by a<a href="http://www.dvdtoiphone4.com/mac-dvd-to-iphone-4.html"> dvd to iphone 4mac</a> converter after our jailbreaking, you will find it is so easy for us to<a href="http://www.dvdtoiphone4.com/guides/convert-dvd-to-iphone-4.html">convertdvd to iphone 4</a>. Now we can jailbreak or unlock iPhone4/3Gs/3G with the latest tool that allows iOS jailbreak 4.2.1/4.1 and thatis compatible with Cydia and MobileSubstrate as easy as ABC. As you've said,this jailbreak is compatible with all models of iPhones but to differentdegrees. The new tool available at UnlockGuide website is very simple to useand guaranteed to jailbreak and unlock iphone4/3GS/3G running iOS 4.2.1 orolder versions. Owners of the popular iPhones will now beable to unlock the very latest ios 4.2.1 for iPhone 3G and iPhone 4. The firstsolution to jailbreak was announced by iPhone Unlocking Ltd. Unlocking a mobilephone is not the same from jailbreaking even if both provide users additionalbenefits to an iPhone. When a buyer purchases an iPhone, it is fixed or lockedbased on what the manufacturer has provided in terms of its exclusivefunctionalities. What's more, any GSM card will be compatible with the softwarebeing offered by iPhone Unlocking Ltd., and the features are also compatiblewith the latest baseband worldwide. User will be able to use any networkprovider from anywhere in the world once they have unlocked their iPhones. If you have a newer model (iPhone 3G andnew iPhone bootrom 4), your <a href="http://www.dvdtoiphone4.com/guides/jailbreak-iphone-4.html">jailbreak iphone4</a> will be tethered. Indeed, if you have not installed any applications thatinterfere with the functioning of the SpringBoard or CommCenter, your iPhonewill boot up correctly. However, if you have installed applications thatrequire MobileSubstrate (Infiniboard example) and that interfere with thenormal operation of SpringBoard, your iPhone will remain stuck on the Applelogo at startup. We also remind those wishing to conserve or unlock unlocktheir iPhone, it should not be used redsn0w and update your phone iOS 4.2.1. Makethe update via iTunes 4.2.1 iOS 10.1 (this is important) using the firmware youjust downloaded (Hold down the Shift key on Windows, then click Update andselect the file. ipsw you downloaded).<br /><br /> <br /><br /> <img src="clip_image001.gif" />

(Updated April 2011)

This guide will help you unock your iPhone using ultrasn0w 1.3 to let you use sim cards from other carriers worldwide.
This is ONLY FOR JAILBROKEN iPhones. If yours is not yet jailbroken, CLICK HERE for guide on how to jailbreak.Ultrasn0w 1.3 unlocks the following basebands for all iPhones:

• 01.59.00 - iPhone 4, iOS 4.0, 4.0.1 & 4.0.2
• 05.13.04 - iPhone 3G & 3GS, iOS 4.0, 4.0.1 & 4.0.2
• 05.12.01 - iPhone 3G & 3GS, iOS 3.1.3
• 05.11.07 - iPhone 3G & 3GS, iOS 3.1 & 3.1.2
• 04.26.08 - iPhone 3G & 3GS, iOS 3.0
• 06.15.00 - iPad baseband, iOS 3.2.2 (for patching iPhone 3G & 3GS BBs past iOS 4.0.2) (?)
• and all older versions

NOTE: 05.14.02 / 02.10.04 baseband from iOS 4.1 and all newer versions, do not have any unlocking tool yet. You can follow me on twitter (kid_ant) or subscribe to my YouTube channel (kidantvideos) for updates.Make sure you are connected to a WiFi signal then follow these steps:

1. Open Cydia
2. Go to Manage and tap on Sources, at the middle of the page
3. Tap repo666.ultrasn0w.com (If the repo is not in your Sources read below)
4. Tap ultrasn0w
5. Tap Install, then tap Confirm
6. Wait until the installation finishes
7. Tap Reboot Device

After the reboot, you should get a signal for your sim carrier, wherever you are in the world. That means your iPhone is now unlocked.



If repo666.ultrasn0w.com is not in your Sources, do this first:

• While in Cydia's Sources page, tap Edit (top-right corner)
• Tap Add (top-left corner)
• Type this on the text box: http://repo666.ultrasn0w.com (with the number zero NOT the letter "O" in ultrasn0w)
• Tap Add Source
• Tap Done (top-right corner)

Proceed to number 3 on the first part of this guide.