https://youtu.be/kDXxM-mCWFgFor anybody else who wants to know the difference.

Get a custom launcher like Nova, add an icon pack and you'll have a different phone automatically.

This is the best answer.You need to learn as an owner of a device, how to optimise it.There are other manufacturers that have devices with auto optimisation, but they can be a hindrance to your experience with your device if you don't know how to twe...

Water resistant is the right term.There is a difference between waterproof and water resistant.

Ideal situation is to factory resetting after a large system update. I didn't initially and I had the same issue for a few days.Give it a go if you can.