Unc0ver Jailbreak

Pwn20wnd released first ever iOS 12.2 Jailbreak with Unc0ver. It was the most successful Jailbreak since iOS 11.
Unc0ver iOS 12 to iOS 12. 2 Jailbreak - Unc0ver v3.3.0 b1 releases adding support for Jailbreak iOS 12.2, iOS 12.1.4 & iOS 12.1.3. Previously, Unc0ver v3.0.0 b29 was updated adding support for iOS 12 - iOS 12.1.2. However, Unc0ver tool does not support for iPhone XS, iPhone XR, iPhone XS Max.
Unc0ver iOS 11 to  iOS 11.4.1 Jailbreak -  Unc0ver tool initially released for iOS 11 to iOS 11.3.1 and then he upgraded tool for iOS 11.4 & iOS 11.4.1 versions too.

Still Unc0ver does not support for iOS 12.3 & higher versions. Check the following pages for other Jailbreak solutions.
iOS 12.4 Jailbreak (Beta)

iOS 12.3 / iOS 12.3.1 / iOS 12.3.2 Jailbreak
iOS 13 Jailbreak (Beta)
Device Compatibility

iPhone X, iPhone 8, iPhone 8 Plus, iPhone 7, iPhone 7 Plus, iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus, iPhone SE, iPhone 5s, 12.9 iPad Pro, 2nd gen.12.9 iPad Pro, 1st gen.10.5 iPad Pro, 9.7 iPad Pro, iPad Air 2, iPad Air, iPad,5th gen, iPad mini 4, iPad mini 3, iPad mini 2, iPod touch 6G

iPhone XS, XS MAX & XR A12 devices not supported yet.

Uncover iOS 12 to iOS 12.2 Jailbreak

There are two methods available for unc0ver Jailbreak.
Unc0ver Jailbreak online method
Unc0ver Jailbreak PC Required method
Online jailbreak is the easiest way, and you can directly download unc0ver Jailbreak IPA to your device.

UnCover Online method exclusively available with  zJailbreak, Xabsi or iExtras third-party app stores.  Use following Online guide to Jailbreak iOS 12.2 - iOS 12 versions.

Developers

Uncover Jailbreak developed by pwn20wnd with Sam Binger (@sbingner.) Also, Dennis Bednarz, and Samg_is_a_ninja even behind this Unc0ver Jailbreak release.
Enable Airplane Mode.
Disable Siri / Disable Touch ID
Close all open applications or games from the app switcher.
Restart your device and then Launch the jailbreak app.
Unc0ver Latest Updates (Changelog)

Unc0ver Jailbreak Guide (PC Required)

 
Step 01 - Download Uncover IPA & Cydia Impactor using the following links.
Step 02 - Connect your device with computer and Launch Cydia impactor from the computer.

Step 03 -  It will detect your device and then drag the Uncover IPA on to Cydia Impactor.

Step 04 - Enter your Apple ID & Password when prompted. It will sideload the Uncover app to your device.

Step 05 - After, few seconds, Uncover app appeared on your device and trust the app before running it. Go to Settings --> General --> Profiles & Device Management --> Trust the app.

Step 06 - Now run the Uncover Jailbreak app from your device and Tap the Jailbreak button to begin the jailbreak process.
Unc0ver Online Jailbreak Guide
Step 01 - First download one of app stores from zJailbreak, Xabsi or iExtras using above buttons. You need to provide the device passcode for the installation process.
Step 02 - Now launch downloaded app store from your device and tap the Unc0ver Jailbreak button to install the unc0ver app to your device.
Step 05 - Wait until Jailbreak Complete. Your device will restart at least twice during the process.

Step 06 - Once exploitation finished, Cydia will be installed on your device.

Enjoy! your iOS device is now jailbroken! Now you can Install the desired tweaks and jailbreak packages.
Step 07 - Wait until jailbreak complete and finally you can see the Cydia on your device homescreen.
Step 03 - Once you have successfully installed the Unc0ver app navigate to Settings > General > Profile & Device Management > Trust the developer profile of unc0ver.

Step 04 - Open the unc0ver app from your device homescreen and tap Jailbreak button to jailbreak your device.
Pwn20wnd is a former member of the Electra Jailbreak team. He owns few Cydia Repos too.

Currently, Unc0ver team working for adding 4k device support of iOS 12 for the very first time. So we can expect Apple TV Jailbreak for iOS 12 very soon. 
5th upgrade - V3.3.0~b1 - b2 -  Adding iOS 12.2 - iOS 12.1.4 Jailbreak support with Sock Puppet exploit for iOS 12.0-12.2 support on A7-A11 devices

V3.0.0~b30 - b59 - Adding partial Jailbreak support for A12 devices. Adding support for all pre-A12 devices with Cydia and Substrate . Updates released for Bug fixes and improve the iOS 12 jailbreak success rate & more
 
 
Prerequisites
Step 07 - Now you can use above online unc0ver Jailbreak guide or Computer guide  to Jailbreak your device with  Unc0ver tool.
Step 06 - Finally it will restart your device and reboot as a new device.
Step 05 - Tap Erase All from popup confirmation message.
How to safely move to Unc0ver from Electra
Step 01 -  You should backup your data with iCloud or iTunes before running the SemiRestore11 / Rollectra tool.
Step 02 - Open Cydia from your iOS device. Search for “SemiRestore11” on the search tab. Select the SemiRestore11 tool from the result list.
Step 03 - Tap on Install to your device. Once done, SemiRestore app will be available on your device homescreen.
Step 04 - Run SemiRestore tool from your device and tap Unjailbreak to start the unjailbreak process.
Unc0ver Jailbreak Vs. Electra Jailbreak
When we compare Unc0ver with Electra Jailbreak, almost both are same. But, Electra does not upgraded for iOS 12 & higher versions yet. Both Unc0ver & Electra Included Cydia which is approved by saurik And use Cydia Substrate for tweak injection instead of Substitute

According to Pwn20wnd, Unc0ver provides better stability, overall reliability, improved battery life/ performance and fixed freeze issues.

If you are facing problems with Electra jailbreak it is time to switch to unc0ver from Electra jailbreak. You need to bring your device in jailbreak state if you’ve already jailbroken your iPhone or iPad with Electra Jailbreak. You can unjailbreak it with Rollectra / SemiRestore.
4th upgrade - V3.0.0~b29 update released with public testing with adding iOS 12 to iOS 12.1.2.

V3.0.0~b20 - b28 updates released for Bug fixing.

3rd upgrade - V3.0.0~b1 update released with adding iOS 11.4.1 and iOS 11.4 Jailbreak.

2nd upgrade - Jailbreak iOS 11.3.1 - iOS 11.2

Initial release - Jailbreak iOS 11.1.2 to iOS 11

Uncover iOS 11 to  iOS 11.4.1 Jailbreak

Use same iOS 12 - iOS 12.2 jailbreak Guides and Download links to complete the process of unc0ver Jailbreak for iOS 11.4.1 to iOS 11 versions.