Earlier today we posted a guide to Jailbreak iPhone 4, iPhone 3GS iOS 4.2.1 with Greenpois0n RC5. As you know Greenpois0n requires your iDevice on stock iOS 4.2.1 and those who rely on ultrasn0w unlock must stay away from Greenpois0n jailbreak.
Fortunately Notcom, guy behind firmware umbrella discovered a method to preserve your iOS 4.0.1 / 4.0.2 baseband 1.59.00 while updating to iOS 4.2.1 (iPhone 4 only). Notcom released the latest version of Firmware Umbrella with this useful feature. Following are the instructions so you can update your iPhone 4 to …

Chronic Dev team released Greenpois0n RC5 untethered jailbreak for iOS 4.2.1 We already posted a guide to Jailbreak iPhone 4, iPhone 3GS iOS 4.2.1 with Greenpois0n RC5 and we are getting random complaints from random users. We’ll post those problems with their solutions in this post, if you have any problem or solution then please share with us in comment section.
Some Tips :

Turn off your auto-sleep or auto lock.
iPhone unlockers are advised to stay away and wait for pwnage tool release.
If you are already running on tethered jailbreak …

As you know Chronic Dev team released the untethered jailbreak for iOS 4.2.1, you can Download Greenposi0n RC5 to Jailbreak iOS 4.2.1. This version of Greenpois0n is as simple as GeoHotz BlackRa1n but for the moment it is available for Mac only. Following are the instructions to jailbreak your iPhone 4 and 3GS already running on stock iOS 4.2.1
Requirements :

Greenpois0n 1.0RC5
iPhone 4 / 3GS already running on stock iOS 4.2.1

Warning :

iPhone unlockers are advised to stay away and wait for pwnage tool release.
If you are already running on tethered …

Chronic Dev team, folks behind the Greenpois0n jailbreak tool, has posted the most awaited update to Greenpois0n. Latest version of Greenpois0n is RC5 and supports untethered iOS jailbreak for iOS 4.2.1 running on iPhone 4, iPhone 3GS, iPod Touch 4G, 3G & Apple TV 2 (Black). Greenpois0n RC5 is only available for Mac OS and Windows & Linux version are likely to be release very soon.
Note :

Greenpois0n is updated with some random bug fixes (Discussed here). Following links are updated with new version.
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Jailbreak iPhone 4, iPhone …

MyWi, infamous iPhone tethering application that allows users to share their 3G connection of the iPhone to browse the internet via the PC / laptop / MacBook / iPod / iPad just got a big upgrade today. New feature is named  ‘On Demand’. The ‘On Demand’ now costs $ 4.99 to the purchase price of MyWi ($ 19.99), promises to give another dimension to the setting up and sharing of WiFi Hotspot automating the activation process:

Official Statement :
Create an iPad® to iPhone® connection On Demand! Having to turn on and …

A new ad for a job at Apple’s site clearly indicates the intention of the company to integrate technology in iOS for 4G LTE devices. The ad is addressed to Shanghai in China, where coincidentally the chairman of China Mobile had said a few days ago that Apple fully supports the next-generation TD-LTE.

Apple’s job site has a posting for an "iOS cellular protocol sw engineer" who would be based in Shanghai, China. The engineer, would "help develop [Apple's] next generation of iOS products." The position’s duties include: "Implementation, Integration, customization, …