Apple released iOS 4.2.1 back in December 2010. Since then iPhone dev-team and various hackers started working on a jailbreak for iPhone, iPad and iPod Touch models. Now on today Chronic dev team released a simple iOS 4.2 jailbreak tool for all supported idevices. The advantage of GreenPois0n RC5 is that it’s an untethered jailbreak tool, and it supports multiple OS platforms. Mac OS version is currently available for download and soon Windows and Linux users would be able to download native versions of  GreenPois0n RC5 for their platforms.
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As promised, iPhone Dev team announced Redsn0w 0.9.7b1 untethered jailbreak for iOS 4.2.1. Redsn0w 0.9.7b1 jailbreak is designed to work with iPhone 4, iPod Touch 4G and Apple iPad. Those who are using iPhone 3G, iPhone 3G S, iPod Touch 2G on iOS 4.2.1 already have a fully working untethered jailbreak with Redsn0w 0.9.6b6. As you might know, an untethered jailbreak let you restart your device to jailbreak mode, without the need of connecting the device to a computer. Redsn0w 0.9. 7b1 download released today is intended for Mac users who are interested in helping the dev team in testing the jailbreak for any bugs.
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The Apple iOS is designed in such a way that all applications with the push facility should request the Apple APNS servers for a token that identifies the device. The application requesting APNS token will be jammed in unlocked iPhone models. So they usually not support push notifications. Unlocked models have less battery life and produce more heat than the officially activated models. Many people who unlocked their iPhone 3G and 3G S with the recent Redsn0w 0.9.6 b5 and Ultrasnow 1.2 were reported to have these problems. Thanks to Sam Bingner, from bingner.com. He developed a Cydia repository called SAM that can officially activate iPhone 3G and 3G S on iOS 4.2.1 without the original SIM card or hactivation.
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Ultrasn0w is a software tool that is used to unlock earlier versions of the iPhone; iPhone 3G, 3GS and iPhone 4 running iOS versions up-to 5.1.1. The suitability of UltraSn0w depends on the baseband or modem firmware of the iPhone that you are using. In all cases, you need to download and use a specific Redsn0w/Pwnagetool variants to install Cydia on your iPhone, which is required for downloading Ultrasn0w. In this article, we will tell you how you can download Ultrasn0w 1.2, 1.2.1, 1.2.5, 1.2.7 and 1.3 versions, and describe the compatible devices and software versions.

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Jailbreaking is a method that allow iPhone, iPod Touch and iPad users to install non-Apple approved applications in their device. It also necessary to Jailbreak iPhone and iPad for carrier unlock process. A Jailbreak will install Cydia, an alternate app store in the device that has several paid and free apps.  Cydia can also be used to unlock hidden feature of in iOS devices. Apple usually release iOS software updates to fix the holes that are being used by hackers to jailbreak and unlock. And the Dev-team release new jailbreak and unlock tool after each new iOS release.The problem here for the users is that each time after a jailbreak, they need to search and find their Cydia apps and re-install them again. So here is how you can Restore Cydia packages from backup after iOS jailbreak for iPhone, iPod Touch and iPad.
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Apple iPhone and iPad use a special Micro Sim card slot. The Micro Sim card in iPhone 4 saves the unused space and  also prevents the quick unlock of the phone from the official carrier. The size of normal Mini Sim card is around 15mm x 25mm. Whereas the size of the Micro Sim card used in iPhone 4 is  only 12mm x 15mm. We can cut the normal Sim card to Micro Sim card manually by using a scale and cutter.  However, the process should be very precise to avoid damage to the Sim card. As an alternative method, there is an iPhone 4 Sim  cutter, which makes it easy to cut mini Sim card to Micro Sim card exactly as required. The package of the product also contains two Sim card adapters in case if the user needs to switch back to Mini Sim mode.

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