How to deal with water damage on iPhone 15?

Immediately power off your iPhone, and let it sit upright with the port facing down to dry it out. Do not try to charge it. Give it up to 24 hours to fully dry out.

If your iPhone still won’t turn on, you are likely looking at a replacement. Water damage causes corrosion to the parts as time goes and cannot be repaired. Apple won’t even service a water damaged iPhone.

Ignore the old wives' tale. Do NOT put the phone in rice.