You Can Jailbreak iOS 8.1.2 with TaiG
Users who are interested in jailbreaking their iPhones and iPads will find that iOS 8.1.2 can be jailbroken using an updated version of the TaIG tool. The new version of TaiG came almost immediately after the release of iOS 8.1.2, which apparently does not patch the method utilized by the jailbreaking utility.
Jailbreaking is unsupported and generally best reserved for advanced iOS users. Apple does not approve of jailbreaks for a variety of reasons.
The latest version of TaIG supports jailbreaking any device that can run iOS 8.1.2, including the newest iPhone 6, iPhone 6 Plus, iPhone 5s / 5c / 5, iPhone 4s, iPad Air 2, iPad Air, iPad 4, and any prior model that also runs the newest iOS version. As with prior versions of TaiG, the utility is currently only available for the Windows operating system, which means a PC and USB cable would be necessary to install the jailbreak onto an iOS device. Once the iPhone or iPad has been successfully jailbroken with the TaiG tool, the jailbreak remains untethered and would no longer require a Windows PC. Mac users can still use the TaIG utility to jailbreak their devices if they have a Windows virtual machine or Boot Camp to run the app from.
Users who are interested can find the latest version here on the TaiG website. Currently the TaIG for iOS 8.1.2 utility is offered in Chinese, but using the tool seems fairly straight forward even for users who are unable to read the Chinese characters. A version translated into English is apparently in the works, as well as a version for Mac users running OS X.
Apple may refuse warranty service for devices that have jailbroken software installed on them. Generally speaking, only technically advanced users who understand the risks and entire process should attempt to jailbreak their iPhone, iPad, or iPod touch hardware. Regardless, always complete a back up before attempting to modify system software.