How to unlock disabled iPhone 6 without iTunes?
Step 1: Press and hold the "Home" button and the "Sleep/Wake" button at the same time.
Step 2: Keep holding both buttons until the Apple logo appears on the screen.
Step 3: Release the buttons and wait for a few minutes until the iPhone restarts.
Step 4: Enter your passcode, if necessary, or set up a new passcode.
Step 5: Your iPhone should now be unlocked and ready to use.