Short answer: turn the device off, disconnect every cable and do not charge it. Prompt professional evaluation gives the device the best chance of recovery.
What to do immediately
- Power the phone off.
- Remove the case and disconnect accessories.
- Keep the charging port pointed downward when practical.
- Bring the device in for evaluation as soon as possible.
What not to do
Do not use a hair dryer, place the phone in an oven, repeatedly turn it on or connect it to power. Rice does not remove contamination from inside the device and can introduce debris.
Why timing matters
Moisture and contaminants can continue affecting internal connections even after the outside looks dry. An evaluation can identify corrosion and damaged components.