How to Jailbreak 12.1.2 without computer. You can do it on iPhone or iPad.

Step 1: To get make iOS 12.1.2 Jailbreak, go to next.tweakboxapp.com and tap Apps at the top of the screen.

— all jailbreak ios 12.1.2 supported devices : list

Step 2: Tap Tweakbox Apps.

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Step 3: Scroll down to find the unc0ver jailbreak iOS 12.1.2 version.

Step 4: Tab “Install” button and then confirm the popup box.

Step 5: Once the download unc0ver jailbreak iOS 12.1.2 completes, go on your iPhone to the Settings, then navigate to General > Profiles & Device Management >  Select Trust from the confirmation box that pops up.

Step 6: After that tab on new unc0ver app on your Home screen and go to Jailbreak iOS 12.1.2. Wait… 

Step 7: Now you can see Cydia iOS 12. Done.