Phone won’t work at water exposure

It is water resistant.

Liquid damage is not covered by the warranty.

You can get an out of warranty replacement from Apple.

From the link I posted that you didn’t read:

Splash, water, and dust resistance are not permanent conditions and resistance might decrease as a result of normal wear. Liquid damage is not covered under warranty

To prevent liquid damage, avoid these:

• Swimming or bathing with your iPhone
• Exposing your iPhone to pressurized water or high velocity water, such as when showering, water skiing, wake boarding, surfing, jet skiing, and so on
• Using your iPhone in a sauna or steam room
• Intentionally submerging your iPhone in water
• Operating your iPhone outside the suggested temperature ranges or in extremely humid conditions
• Dropping your iPhone or subjecting it to other impacts
• Disassembling your iPhone, including removing screws

Water damage is not covered by any warranty.

https://support.apple.com/en-us/HT207043

Water resistant is not the same as waterproof.