Is IPhone 12 Pro Max waterproof? Can I take photos while swimming?

No, it is water and dust resistant, not waterproof. Water damage is not covered by the warranty.

no it's not waterproof. you should never intentionally submerge an iPhone

Absolutely not! There is no waterproof cell phone of any make or model. It is water resistant. Meaning, you can hold it out in a light rain for a couple of minutes while on a call, or splash a small amount of liquid on it. It can never, ever be submerged.