Water resistant??

About splash, water, and dust resistance of iPhone 7 and later

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

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

Looking at their limited warranty, it doesn't seem so.

https://www.apple.com/legal/warranty/products/ios-warranty-document-us.html

If it's still within warranty it might be worth seeing if an Apple repair centre will repair/replace but I wouldn't hold my breath.

It is not water proof. The description of being in water for 30 minutes at 3 feet is under controlled laboratory conditions. Anytime a phone is submerged in water, it will get damaged.

No. Water in an iPhone is classified as damage and not covered.