[deadwing0]

I would love to know the physics here. I had a Xiaomi phone a couple years back that had a glass back and would do this as well. It's been a while so I don't remember details, but is it just because the surface it's resting on isn't completely level?

[joezydeco]

What if the vibration “engine” is unbalanced? Was the 4XL trying to copy Apple’s gimmick?