The Xiaomi Mi Mix 3 uses a unique sliding mechanism that relies on two pairs of strong neodymium magnets to hold the phone in the up and down positions and also provide the "springy" feeling in between. If you're curious about how that works, you can watch Zack from JerryRigEverything take the phone apart. You can see two magnets at 2:35, but that's only half of them. The other half are behind the screen - they line up perfectly when the Mi Mix 3 is closed and push each other away when it is open. There's a ribbon cable that hooks through a hole in the motherboard to connect the two...