my phone won't bloody vibrate no matter what. please help
What version of OS?
Try restarting your phone or factory resetting it.
Then take or send your device into a OnePlus service center for a inspection of possible repairs.
i am also facing same problem...for some times...
me facing same on OP 6T.
no vibration at all.
Try turning one of the accessibility options on. It worked for me. Weird bug.
I found a solution. Seems like battery saver mode has turned off vibration to save power. It's an Android feature.
OnePlus 7T Specs Explained: Warp Charge 30T
by AZaiarnyi, 2019-10-11