is the iphone xs max waterproof?

No. There are no smartphones from any manufacturer that are waterproof. iPhone X series are water resistant, meaning they can survive occasional splashes. But not immersion, for even a second. And the warranty does not cover water damage.

No. The phone is water resistant, not waterproof. Do not intentionally let it get wet and certainly don’t drop in a swimming pool.

Definitely not waterproof.

It is water resistant not waterproof.